foo=:4 :0
assert. 4 = (3!:0) x NB. x is integer
assert. 2 = # x NB. x has 2 items
assert. 2 = #$ x NB. x has rank 2
assert. (# y) = +/{: x
assert. 0 < <./{. x NB. {.x is positive
'd l'=.x
d <@]^:[&> (; l {.&.> 1) <;.1 y
)
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