You can use the view. For example, the box view ( 5!:2) tolower:
(5!:2) <'tolower'
βββ¬ββ¬βββββββββββββββββββββββββββββββββββββββββ
β3β:βx=. I. 26 > n=. ((65+i.26){a.) i. t=. ,yβ
β β β($y) $ ((x{n) { (97+i.26){a.) x}t β
βββ΄ββ΄βββββββββββββββββββββββββββββββββββββββββ
its linear ( 5!:5) is equal to:
(5!:5) <'tolower'
3 : 0
x=. I. 26 > n=. ((65+i.26){a.) i. t=. ,y
($y) $ ((x{n) { (97+i.26){a.) x}t
)
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