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lambda a:[*min({'aa','ab','bb','ba','c'}-{(a.replace('c','')+'c'*('c'in a))[i:i+2]for i in[0,2,4,6]}][0])
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lambda a:[*{'aa','ab','bb','ba','c'}-{(a.replace('c','')+'c'*('c'in a))[i:i+2]for i in[0,2,4,6]}][0]
Attempt This Online!
lambda a:min({'aa','ab','bb','ba','c'}-{a.replace('c','')[i:i+2]for i in[0,2,4,6]})
