If you store your arrays (more specifically references to your arrays) in an array, you can say 

my @arrayOfArrays = ( \@a_1,\@a_2,...,\@a_20 );
my $n = 10;
nfor( $n, @arrayOfArrays[ 0..$n-1 ] );

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In reply to Re^5: Variable number of foreach loops by hdb
in thread Variable number of foreach loops by abhay180

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