b=. 2 2 $'abcd'
   copy=.13 : ',./ > x $< y '   NB. copies the box side by side
   3 copy b
ababab
cdcdcd
   4 copy b
abababab
cdcdcdcd

Maybe, I could use under(as in  13 : ',./ (x&$)&.< y') but the final
form isn't tacit, which is not a big problem; however I'm interested
in knowing other possibilities.

Any suggestions?
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