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white(x11)=.false,
shaded(x11)=.false,
shaded(x12)=.false,
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white(x14)=.false,
black(x13)=.false],
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crl(x11)=.true,
next(x12,x11)=.true,
crl(x12)=.true,
sqr(x13)=.true,
crl(x14)=.true,
next(x14,x13)=.true,
next(x13,x12)=.true]).
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object(2,[black(x21)=.true,
white(x22)=.true,
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black(x22)=.false,
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sqr(x22)=.true,
sqr(x23)=.true,
next(x22,x21)=.true,
next(x23,x22)=.true]).
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object(3,[black(x31)=.true,
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object(4,[shaded(x41)=.true,
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