j←?≢XX x←XX[j;] ⍝ new record timeit 'X1←XX⍪x' 0.000574 timeit 'XX⍪←x' 0.000003
t←j⌷¨TT ⍝ new record timeit 'T1←TT⍪¨t' 0.000071 timeit 'TT⍪¨←t' 0.000071