Here is a script to use to experiment:
a=:?>:i.6
]a=:=a
]b=:?>:i.6
a #@# b
NB. x u@v y ↔ u x v y
#a#b
NB. ([: f g)"({. g b. 0) <=> f@g
a(([:##)"({.# b. 0))b
a #@:# b
Linda
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