I sent two replies that do not seem to appear anywhere:
the first said 'Thanks a million'
the second stated that my grid had a typing error - c2/r5 should have been a '2' (not a '3')
[quote="Animator"]Ignore that previous hint. You are on the wrong track...
Column 2 (and row 5) has the number 3 twice... This is impossible, you made a mistake somewhere...[/quote]