Have you tried this?

   5!:1 <'foo'
┌──────────────────────────────────────┐
│┌─┬──────────────────────────────────┐│
││3│┌─────────────┬───────────────┬──┐││
││ ││┌─┬─────────┐│┌─┬───────────┐│*:│││
││ │││0│0 1  2  3│││.│┌───────┬─┐││  │││
││ │││ │4 5  6  7│││ ││┌─┬───┐│*│││  │││
││ │││ │8 9 10 11│││ │││/│┌─┐││ │││  │││
││ ││└─┴─────────┘││ │││ ││+│││ │││  │││
││ ││             ││ │││ │└─┘││ │││  │││
││ ││             ││ ││└─┴───┘│ │││  │││
││ ││             ││ │└───────┴─┘││  │││
││ ││             │└─┴───────────┘│  │││
││ │└─────────────┴───────────────┴──┘││
│└─┴──────────────────────────────────┘│
└──────────────────────────────────────┘


-- 
(B=)
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