DB<20> use Data::Dump qw/dd/;


  DB<21>  $str = join " ", 10..15


  DB<22> dd ["$_",( split ' ', $str, $_)] for 0..6
[0, 10 .. 15]
[1, "10 11 12 13 14 15"]
[2, 10, "11 12 13 14 15"]
[3, 10, 11, "12 13 14 15"]
[4, 10, 11, 12, "13 14 15"]
[5, 10 .. 13, "14 15"]
[6, 10 .. 15]