Some alternative spellings:
(¬∘∧⟜«' '=⊢)⊸/ (¬·«⊸∧' '=⊢)⊸/ {¬«⊸∧' '=x}⊸/ # should have double-struck x here (U+1D569), but hn removes it
There's also the much less vector oriented spelling:
(1 ∾˜ " "⊸(¬∘⍷))⊸/
There's also the much less vector oriented spelling:
which removes the first space of each occurrence of double spacing