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| KASH3 Reference Manual
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| ### Function Preimages ( alist A, any val ) -> any key ### Optional Arguments
Fail | any |  | Determines what to return in case of failure.
### Description Return a list of keys whose associations are `val' in the alist `A'. ### Examples A:=Alist(["foo","someval1"],["bar","someval2"]); Preimages(A,"someval1"); Preimages(A,25);
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