Small correction. No need to take heads at the end:
> {."1 ([: }:"1 [: ; (b, {:"1)<@}./. e,])^:(#{.z) y,.z
, ([: ; (b, {:"1) <@(}:"1@:}.)/. e,])^:(#{.z) y,.z
--
Met vriendelijke groet,
=@@i
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