<snapdata remixID="8932003"><project name="U2L4 Checkerboard Project" app="Snap! 5.1, http://snap.berkeley.edu" version="1"><notes></notes><thumbnail>data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAFv0lEQVR4Xu3dT29UZRTH8dPQzkwLImGsGg0pZhpIBEJdwGKwLSmuWbGQWDCGtIQEA4TEF+DSQFyQKBGUalmy8h1YsFX3YGzSBQtBE01U7NCZFobcGWlLnGjPH5g7k2+X5PmdZ+55PjP39vL0Tke1Wq0KP3SgSR3oAGCTOs+0tQ4AEAhN7QAAm9p+JgcgBpraAQA2tf1Mnn6AX19Tr9J0qSxzlUVVrpDpkmJPVpVJBk/+8bc6U+zJSSHTqcrNVZZkurSgyiSDj2zaoM6Y+lfol+K+N9VzpR/gwFb1QY39/Jtc/XNelRt9fr1cevUFVSYZ3H3rtjrz2St5NYwE+vid39Vz3X+9T50x9e/ou3Lp8oR6LgD+0zIArtgB4Or3EZ+AtW7wCaj+cA0KALCpAMfGT8js7Kzs3btHLn76idy791fDhR3lFOw8hXANuNzA1afgzfm8bNu+Q2a+nZLivkHZPTAgd+/ekY0bn5PJL1eu+QC46n1puoYBYEOAyT8ODe2Xh9Wq3Lj+zfKYZAfBO6NHZb5Ukhd7e2Xnrl0yfvyE+rTHLyH8EvIvNI3ewGfOfiAfn/+oIbAtfa/JsWNjcur0GcnlciqEAATg/wIcHN4vP3z3vZTL92tjM9luOXnyfZmZmZGRAyNy5YvLMnLgLW7DPO4kp+AVU977gINDw1KpLEqhv18WFsqSz2+WH2/dlBvXp56AyzUg14ANT31ugIPDNXwTVz7/z1MrAAH4VACu9YIOgAAE4FrfLapx3Ihu6o3ota5V234Cdmc61tqD5XFt+Z/9Kb9PKQcPiXx4Tr1Wqb8NA8D6mqZ9swQAV733+ARcacaz2i4GQAA2PP0BUH1V8GSAUzCnYCchXxyAAPQJcqYBCEAnIV8cgAD0CXKmAQhAJyFfHIAA9AlypgEIQCchXxyAAPQJcqYBCEAnIV98cqv+aQWz5UX5ZemBauKXO9fJtmyXKpMMnprXPy5je7ZLXupcp5rr16UH8lNZ97iRZIKh9bq/0Ugylv4V3x6V9y5cVB1TMjj1mxGE7Vi1ReUP09W2gwIABGAQJVsZAALQJicoBUAABlGylQEgAG1yglIABGAQJVsZAALQJicoBUAABlGylQEgAG1yglIABGAQJVsZAALQJicoBUAABlEylWEzQr1tbEYw8fGH2I5V7yFPRvBbMlUAIABNcKJCAARglCVTHQAC0AQnKgRAAEZZMtUBIABNcKJCAARglCVTHQAC0AQnKgRAAEZZMtUBIABNcKJCAARglCVTHQAC0AQnKgRAAEZZstVhO1atbzwZwcbHnwIgAP2KHBUACEAHH38UgAD0K3JUACAAHXz8UQAC0K/IUQGAAHTw8UcBCEC/IkcFAALQwccfBSAA/YocFQAIQAcffxSAAPQrclQAIAAdfNzRsd4N6hrt+D0caf8ek8Khw1I8d0G9Vqn/nhC2Y9XXlEdzqG3HBAAIwBhJxioABKCRTkwMgACMkWSsAkAAGunExAAIwBhJxioABKCRTkwMgACMkWSsAkAAGunExAAIwBhJxioABKCRTkwMgACMkWSswmaEeuPYjGAE5I6xHavWQh7N4ZZkLABAABrpxMQACMAYScYqAASgkU5MDIAAjJFkrAJAABrpxMQACMAYScYqAASgkU5MDIAAjJFkrAJAABrpxMQACMAYScYqAASgkU5MDIAAjJFkq8J2rHrfeDKCzY87BUAAuhF5CgAQgB4/7iwAAehG5CkAQAB6/LizAASgG5GnAAAB6PHjzgIQgG5EngIABKDHjzsLQAC6EXkKABCAHj/uLAAB6EbkKQBAAHr8uLOTX02oaxR7clLIdKpyc5UlmS4tqDLJ4COb9N9jMl0qy1xlUTVXIdMlxZ6sKpMMTp6ooP2x9E+29Im8sUc7laT+e0LUR0SgpToAwJZarvZ7sQBsvzVtqSMCYEstV/u9WAC235q21BEBsKWWq/1e7CMA4sIvx7pr9gAAAABJRU5ErkJggg==</thumbnail><stage name="Stage" width="480" height="360" costume="0" color="255,255,255,1" tempo="60" threadsafe="false" volume="100" pan="0" lines="flat" ternary="true" codify="false" inheritance="false" sublistIDs="false" scheduled="false" id="1"><pentrails>data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAeAAAAFoCAYAAACPNyggAAAZlklEQVR4Xu3VMU7zWhSF0bhAglGkp2H+w6BJn1GAROGnN4ZP9/fRzaLfJl7eOvu4+SNAgAABAgT+ucDxz/+jf0iAAAECBAjcDLASECBAgACBCwQM8AXo/iUBAgQIEDDAOkCAAAECBC4QMMAXoPuXBAgQIEDAAOsAAQIECBC4QMAAX4DuXxIgQIAAAQOsAwQIECBA4AIBA3wBun9JgAABAgQMsA4QIECAAIELBAzwBej+JQECBAgQMMA6QIAAAQIELhAwwBeg+5cECBAgQMAA6wABAgQIELhAwABfgO5fEiBAgAABA6wDBAgQIEDgAgEDfAG6f0mAAAECBAywDhAgQIAAgQsEDPAF6P4lAQIECBAwwJt34Py6n5Nf8ePxnPzzbj+f99G/j1/7PPz29vv9u43euNE/rlVD+n8BA9x6YID5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHgfe32xkfsTTuwDRefvyaQEtP79/x/TzaG65Nj/5xa1/9NZ5ugNt3/ng82wMWp6cfQH6tAPyanwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBc6v+xkfsTTuwDRefvyaQEtP79/v3+1ob7g2PfrHrX3113i6AW7f+efz3h6wOD39APJrBeDX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKPD+djvjI5bGHZjGy49fE2jp6f07vp9He8O16dE/bu2rv8bTDXD7zh+PZ3vA4vT0A8ivFYBf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko8D5dT/jI5bGHZjGy49fE2jp6f37/bsd7Q3Xpkf/uLWv/hpPN8DtO/983tsDFqenH0B+rQD8mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQXe325nfMTSuAPTePnxawItPb1/x/fzaG+4Nj36x6199dd4ugFu3/nj8WwPWJyefgD5tQLwa34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQwwA3QAeTXBFpa/5qfAW5+0lHAADdAB5BfE2hp/Wt+Brj5SUcBA9wAHUB+TaCl9a/5GeDmJx0FDHADdAD5NYGW1r/mZ4Cbn3QUMMAN0AHk1wRaWv+anwFuftJRwAA3QAeQXxNoaf1rfga4+UlHAQPcAB1Afk2gpfWv+Rng5icdBQxwA3QA+TWBlta/5meAm590FDDADdAB5NcEWlr/mp8Bbn7SUcAAN0AHkF8TaGn9a34GuPlJRwED3AAdQH5NoKX1r/kZ4OYnHQUMcAN0APk1gZbWv+ZngJufdBQ4v+5nfMTSuAPTePnxawItPb1/v3+3o73h2vToH7f21V/j6Qa4feefz3t7wOL09APIrxWAX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKPA+9vtjI9YGndgGi8/fk2gpaf37/h+Hu0N16ZH/7i1r/4aTzfA7Tt/PJ7tAYvT0w8gv1YAfs3PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzk44CBrgBOoD8mkBL61/zM8DNTzoKGOAG6ADyawItrX/NzwA3P+koYIAboAPIrwm0tP41PwPc/KSjgAFugA4gvybQ0vrX/Axw85OOAga4ATqA/JpAS+tf8zPAzU86ChjgBugA8msCLa1/zc8ANz/pKGCAG6ADyK8JtLT+NT8D3Pyko4ABboAOIL8m0NL61/wMcPOTjgIGuAE6gPyaQEvrX/MzwM1POgoY4AboAPJrAi2tf83PADc/6ShggBugA8ivCbS0/jU/A9z8pKOAAW6ADiC/JtDS+tf8DHDzkyZAgAABAlsKHFu+lZciQIAAAQLDBQzw8A/k5xEgQIDAngIGeM/v6q0IECBAYLiAAR7+gfw8AgQIENhTwADv+V29FQECBAgMFzDAwz+Qn0eAAAECewoY4D2/q7ciQIAAgeECBnj4B/LzCBAgQGBPAQO853f1VgQIECAwXMAAD/9Afh4BAgQI7ClggPf8rt6KAAECBIYLGODhH8jPI0CAAIE9BQzwnt/VWxEgQIDAcAEDPPwD+XkECBAgsKeAAd7zu3orAgQIEBguYICHfyA/jwABAgT2FDDAe35Xb0WAAAECwwUM8PAP5OcRIECAwJ4CBnjP7+qtCBAgQGC4wH8zv4JoMsryKQAAAABJRU5ErkJggg==</pentrails><costumes><list struct="atomic" id="2"></list></costumes><sounds><list struct="atomic" id="3"></list></sounds><variables></variables><blocks></blocks><scripts></scripts><sprites><sprite name="Sprite" idx="1" x="200" y="140" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="true" costume="0" color="8,5,0,1" pen="tip" id="8"><costumes><list struct="atomic" id="9"></list></costumes><sounds><list struct="atomic" id="10"></list></sounds><blocks></blocks><variables></variables><scripts><script x="10" y="10"><block s="clear"></block></script><script x="50" y="104"><block s="gotoXY"><l>-120</l><l>120</l></block></script><script x="16" y="181.66666666666686"><custom-block s="draw black square size %n"><l>20</l></custom-block></script><script x="20" y="238.66666666666686"><custom-block s="draw red square size %n"><l></l></custom-block></script><script x="334" y="151"><block s="forward"><l>20</l></block></script><script x="330" y="201"><custom-block s="Draw Checker Board 1"></custom-block><custom-block s="Draw Checkerboard 2"></custom-block><custom-block s="Draw Checkerboard 3"></custom-block><custom-block s="Draw Checkerboard 4"></custom-block><custom-block s="Draw Checker Board 5"></custom-block><custom-block s="Draw Checker Board 6"></custom-block><custom-block s="Draw Checker Board 7"></custom-block><custom-block s="Draw Checker Board 8"></custom-block></script></scripts></sprite><watcher scope="Stage" s="reportMouseX" style="normal" x="10" y="10.000000000000007" color="4,148,220" hidden="true"/><watcher scope="Stage" s="reportMouseY" style="normal" x="10" y="31.000001999999995" color="4,148,220" hidden="true"/></sprites></stage><hidden></hidden><headers></headers><code></code><blocks><block-definition s="set flag %&apos;which&apos; to %&apos;tf&apos;" type="command" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%s" readonly="true"><options>Presentation mode&#xD;Retina display support&#xD;Long form input dialog&#xD;Plain prototype labels&#xD;Input sliders&#xD;Execute on slider change&#xD;Clicking sound&#xD;Turbo mode&#xD;Flat design&#xD;Keyboard editing&#xD;Table support&#xD;Table lines&#xD;Visible stepping&#xD;Thread safe scripts&#xD;Prefer smooth animations&#xD;Flat line ends&#xD;Codification support&#xD;Inheritance support</options></input><input type="%b"></input></inputs><script><block s="doRun"><block s="reportJSFunction"><list><l>which</l><l>tf</l></list><l>var   stage = this.parentThatIsA(StageMorph),&#xD;        ide = stage.parentThatIsA(IDE_Morph),&#xD;        world = stage.parentThatIsA(WorldMorph);&#xD;&#xD;if (tf != !!tf) return;&#xD;&#xD;try{&#xD;ide.savingPreferences = false;&#xD;&#xD;switch (which) {&#xD;    case &apos;Presentation mode&apos;:&#xD;        if (tf != ide.isAppMode) ide.toggleAppMode();&#xD;        break;&#xD;    case &apos;Retina display support&apos;:&#xD;        if (tf != isRetinaEnabled()) ide.toggleRetina();&#xD;        break;&#xD;    case &apos;Long form input dialog&apos;:&#xD;        if (tf != InputSlotDialogMorph.prototype.isLaunchingExpanded)&#xD;            ide.toggleLongFormInputDialog();&#xD;        break;&#xD;    case &apos;Plain prototype labels&apos;:&#xD;        if (tf != BlockLabelPlaceHolderMorph.prototype.plainLabel)&#xD;            ide.togglePlainPrototypeLabels();&#xD;        break;&#xD;    case &apos;Input sliders&apos;:&#xD;        MorphicPreferences.useSliderForInput = tf;&#xD;        break;&#xD;    case &apos;Execute on slider change&apos;:&#xD;        ArgMorph.prototype.executeOnSliderEdit = tf;&#xD;        break;&#xD;    case &apos;Clicking sound&apos;:&#xD;        if (tf != !!BlockMorph.prototype.snapSound)&#xD;            BlockMorph.prototype.toggleSnapSound();&#xD;        break;&#xD;    case &apos;Turbo mode&apos;:&#xD;        if (tf != stage.isFastTracked)&#xD;            ide.toggleFastTracking();&#xD;        break;&#xD;    case &apos;Flat design&apos;:&#xD;        if (tf == MorphicPreferences.isFlat) break;&#xD;        if (tf)&#xD;            ide.flatDesign();&#xD;        else&#xD;            ide.defaultDesign();&#xD;        break;&#xD;    case &apos;Keyboard editing&apos;:&#xD;            ScriptsMorph.prototype.enableKeyboard = tf;&#xD;        break;&#xD;    case &apos;Table support&apos;:&#xD;            List.prototype.enableTables = tf;&#xD;        break;&#xD;    case &apos;Table lines&apos;:&#xD;                TableMorph.prototype.highContrast = tf;&#xD;        break;&#xD;    case &apos;Visible stepping&apos;:&#xD;        if (tf != Process.prototype.enableSingleStepping)&#xD;            ide.toggleSingleStepping();&#xD;        break;&#xD;    case &apos;Thread safe scripts&apos;:&#xD;        stage.isThreadSafe = tf;&#xD;        break;&#xD;    case &apos;Prefer smooth animations&apos;:&#xD;        if (tf != (StageMorph.prototype.frameRate &gt; 0))&#xD;            ide.toggleVariableFrameRate();&#xD;        break;&#xD;    case &apos;Flat line ends&apos;:&#xD;        SpriteMorph.prototype.useFlatLineEnds = tf;&#xD;        break;&#xD;    case &apos;Codification support&apos;:&#xD;        if (tf != StageMorph.prototype.enableCodeMapping) {&#xD;            StageMorph.prototype.enableCodeMapping = tf;&#xD;            ide.currentSprite.blocksCache.variables = null;&#xD;            ide.currentSprite.paletteCache.variables = null;&#xD;            ide.refreshPalette();&#xD;        }&#xD;        break;&#xD;    case &apos;Inheritance support&apos;:&#xD;        if (tf != StageMorph.prototype.enableInheritance) {&#xD;            StageMorph.prototype.enableInheritance = tf;&#xD;            ide.currentSprite.blocksCache.variables = null;&#xD;            ide.currentSprite.paletteCache.variables = null;&#xD;            ide.refreshPalette();&#xD;        }&#xD;        break;&#xD;};&#xD;}&#xD;finally {&#xD;ide.savingPreferences = false;&#xD;};&#xD;</l></block><list><block var="which"/><block 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value</l><l>40</l></block></script></block></script></block-definition><block-definition s="Draw Checker Board 7" type="command" category="pen"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doDeclareVariables"><list><l>x value</l></list></block><block s="doSetVar"><l>x value</l><l>-120</l></block><block s="doFor"><l>row</l><l>1</l><l>8</l><script><block s="gotoXY"><block var="x value"/><l>100</l></block><block s="doIfElse"><block s="reportEquals"><block s="reportModulus"><block var="row"/><l>2</l></block><l>1</l></block><script><custom-block s="draw black square size %n"><l>40</l></custom-block></script><script><custom-block s="draw red square size %n"><l>40</l></custom-block></script></block><block s="doChangeVar"><l>x value</l><l>40</l></block></script></block></script></block-definition><block-definition s="Draw Checker Board 8" type="command" category="pen"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doDeclareVariables"><list><l>x value</l></list></block><block s="doSetVar"><l>x value</l><l>-120</l></block><block s="doFor"><l>row</l><l>1</l><l>8</l><script><block s="gotoXY"><block var="x value"/><l>140</l></block><block s="doIfElse"><block s="reportEquals"><block s="reportModulus"><block var="row"/><l>2</l></block><l>1</l></block><script><custom-block s="draw red square size %n"><l>40</l></custom-block></script><script><custom-block s="draw black square size %n"><l>40</l></custom-block></script></block><block s="doChangeVar"><l>x value</l><l>40</l></block></script></block></script></block-definition><block-definition s="Draw Checker Board 1" type="command" category="pen"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doDeclareVariables"><list><l>x value</l></list></block><block s="doSetVar"><l>x value</l><l>-120</l></block><block s="doFor"><l>row</l><l>1</l><l>8</l><script><block s="gotoXY"><block var="x value"/><l>-140</l></block><block s="doIfElse"><block s="reportEquals"><block s="reportModulus"><block var="row"/><l>2</l></block><l>1</l></block><script><custom-block s="draw black square size %n"><l>40</l></custom-block></script><script><custom-block s="draw red square size %n"><l>40</l></custom-block></script></block><block s="doChangeVar"><l>x value</l><l>40</l></block></script></block></script></block-definition></blocks><variables></variables></project><media name="U2L4 Checkerboard Project" app="Snap! 5.1, http://snap.berkeley.edu" version="1"></media></snapdata>