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Type signature on recursive function

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Original file line number	Diff line number	Diff line change
`@@ -16,6 +16,7 @@ loop acc lst =`
`16`	`16`
`17`	`17`	`appearTwice::Orda=> [a]->Maybea`
`18`	`18`	`appearTwice=recM.emptywhere`
	`19`	`+rec::Orda=>Mapaa-> [a]->Maybea`
`19`	`20`	`rec seen[]=Nothing`
`20`	`21`	`rec seen (x:xs)=`
`21`	`22`	`caseM.lookup x seenof`

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