cs.gentleknowledge rising/falling sin bouncy ball

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LanguageMercury
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reset setxy 250 250 to magiball :g :a :g1 repeat 500[ make "g 0 make "g1 0 repeat 255[ color [0 :g 0] circle :g1 make "g1 :g1 + 0.1 make "g :g + 1 ] sety 250 + 250 * sin :a make "a :a + 1 clean ] end magiball 0 0 0
THIS IS LOGO!!!!!!!!!!
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