Thanks choroba, I'm amazed how quickly you worked that. I will try to understand your code to solve my next problem but in the meantime I'll tell you what it is: when there is more than one line the code seems to go into an infinite loop - how to break out of the loop in that situation? (and sorry for being a pest) 
my @AoA = (
    [11,29, 10,25],
    [15,35, 11,29],
    [15,15, 11,21],
    [10,25, 11,21],
    [15,35, 21,39],
    [25,40, 21,39],
    [21,11, 25,10],
    [15,15, 21,11],
    [35,35, 29,39],
    [29,39, 25,40],
    [35,15, 29,11],
    [25,10, 29,11],
    [40,25, 39,29],
    [35,35, 39,29],
    [39,21, 40,25],
    [35,15, 39,21],

    [61,29, 60,25],
    [60,25, 61,21],
);

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In reply to Re^4: Combine line segments to form a single line by bangor
in thread Combine line segments to form a single line by bangor

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