Just adapt the solution I gave in my other post:

say join ' ', map splice( $_, 0, 3 ), \@array1, \@array2 while @array1 or @array2;

If you need to access your original arrays later, make copies and destroy these instead.

In reply to Re^3: issue with print/join 2 arrays by Not_a_Number
in thread issue with print/join 2 arrays by juanito23

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