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(F=.!arg:0&1|!arg+-1*M$(F$(!arg+-1)));
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(M=.!arg:0&0|!arg+-1*F$(M$(!arg+-1)));
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-1:?n&whl'(!n+1:~>20:?n&put$(F$!n " "))&put$\n
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1 1 2 2 3 3 4 5 5 6 6 7 8 8 9 9 10 11 11 12 13
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-1:?n&whl'(!n+1:~>20:?n&put$(M$!n " "))&put$\n
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0 0 1 2 2 3 4 4 5 6 6 7 7 8 9 9 10 11 11 12 12
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