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Task/Ackermann-function/J/ackermann-function-1.j
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Task/Ackermann-function/J/ackermann-function-1.j
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ack=: c1`c1`c2`c3 @. (#.@,&*) M.
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c1=: >:@] NB. if 0=x, 1+y
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c2=: <:@[ ack 1: NB. if 0=y, (x-1) ack 1
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c3=: <:@[ ack [ ack <:@] NB. else, (x-1) ack x ack y-1
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