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Consider the reduction system containing the following rules, where are function symbols of arity 1:
Which of the following terms constitute a critical pair for this reduction system?
Important: Since one can apply variable renamings in different ways, please consider the options below up to variable renaming. That is, marking an option means "there is some variable renaming such that and form a critical pair"; leaving that same option unmarked therefore means "there is no variable renaming such that and form a critical pair".