Or, perhaps a simpler alternative demonstrated under the Perl debugger: 

  DB<1> @x = qw{X A B};

  DB<2> $x = shift @x;

  DB<3> print map {" $_  $x,"} @x;
 A X, B X,

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In reply to Re^2: hash of hashes by Laurent_R
in thread hash of hashes by Anonymous Monk

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