How to merge $A and $B to become $AB

How to merge $A and $B to become $AB. like below

Before merge:

$A= array(
array(1,3,),
array(2,6,),
array(3,13,),
);
$B = array(
array(5,3),
array(6,1),
array(2,13),
);

After merge become:

$AB = array(
array(1,3,5,3),
array(2,6,6,1),
array(3,13,2,13),
);

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