Code:
a,b,c,d,e,f,g,h
1,,3,4,5,6,7,8
11,12,,14,15,16,17,18
21,22,23,,25,26,27,28
31,32,33,34,,36,37,38
41,42,43,44,45,,47,48
51,52,53,54,55,56,,58
61,62,63,64,65,66,67,
71,72,73,74,75,76,77,78
81,82,83,84,85,86,87,88
91,92,93,94,95,96,97,98
101,102,103,104,105,106,107,108
111,,113,114,115,116,117,118
121,122,123,,125,126,127,128
131,132,133,134,135,136,137,138
141,142,143,144,145,146,147,148
151,152,153,154,155,,157,158
161,162,163,164,165,166,167,168
171,172,173,174,,176,177,178
181,182,,184,,186,187,188