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use strict;
use warnings;
...
            images         => ['tiled-horizontally.jpg','tiled-horizon
+tally.jpg','tiled-horizontally.jpg' ], 
            verbosity    => 1,
);

New image tiled-horizontally.jpg (900 x 400) will be tiled horizontall
+y using 3 images

...

Succesfully wrote tiled-3x3.jpg.