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start with first row in order, then keeping each row in same order move the squares over 2 spaces.
e.g.
abcdefgh
cdefghab
efghabcd
ghabcdef
bcdefgha
defghabc
fghabcde
habcdefg
cdefghab
efghabcd
ghabcdef
abcdefgh
or You could move them over just one square each row to give a nice diagonal effect with each colour
edit:
like this
abcdefgh
bcdefgha
cdefghab
defghabc
efghabcd
fghabcde
ghabcdef
habcdefg
abcdefgh
bcdefgha
cdefghab
defghabc
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