okay with , but not with {~
1 2 3 4 5 6 7 _1 _1 ({~)^:(0 1 2) 0
0 1 2
1 2 3 4 5 6 7 _1 _1 ({~)^:(<3) 0
0 1 2 3 4 5 6 7 _1
'a',^:(0 1 2)'b'
b
ab
aab
'a',^:(<3)'b'
b
ab
aab
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