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#!/usr/bin/perl
use strict;
...
        $k++;
    }
}

5  4  7  2  1  3  6  9  8  10  
middle: 5
...
RightSide:
3 6 9 8 10 
Can't use string ("5") as an ARRAY ref while "strict refs" in use at m
+ergeSort.pl line 34.