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Sequences -- unit type defining features related to Sequence but not requiring
an instance

monoid of Sequences with infix concatentation operation.

create an empty list

get the index of x within this list or nil if it does not exist

determine the index of element x within list l. 0 if x is at the head
of the list, 1 if it comes directly after head, etc. nil if x is not
in the list.