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C:\>perl -MMath::GMP -wle "@x = qw(a b c d e f g h i j k l m n); print + $x[Math::GMP->new(-2)];" m
C:\>perl -MMath::GMPz -wle "@x = ('a' .. 'n'); for(Math::GMPz->new(0) +.. Math::GMPz->new(@x - 1)) { print $x[$_] }" a ... l m n