Thanks everyone for their help! The order doesn't matter so the variant of the code supplied by moritz and jpl works a treat. Highly impressed by the speed of answering btw; I just checked back on the site I never expected replies to be so quick... long live the brotherhood!

Cheers!

Reuben

In reply to Re^2: counting pairwise incidences by reubs85
in thread counting pairwise incidences by reubs85

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