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DB<2> $mref = [ qw / 5 4 4 2 4/ ]; ... 0 2 4 ARRAY(0x6005e8c40) 0 4
DB<6> use Data::Dumper; ... ] ];
DB<8> $mref = [ [ qw / 5 4 4 2 4/ ], ]; DB<9> $nref = [ map {[$_]} map {@{$_}} @$mref ];