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    [\~] 1 xx *

    pugs> .say for [\~] 1 xx 10
    1
...
    11111111
    111111111
    1111111111

    1...{$_~1}

    1,11,111,1111 ... {$^previous ~ 1}

1,*~1...*
1, 11, 111, 1111, {$^previous ~ 1} ... *