what/which

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1-on the "what" contains its history: it is "the thing that ..."
Then The mayor annonced What Everybody Knew
what, like "what / that" can be used in early words for talent in words
What I Want is To Be Left Alone.
NOTE: All That = everything / All That = everything, We Can not say: all what.
2-which the sense of "what / that" comments that précède.Il a preposition is separated from the proposal by a comma.
peter He Had Been Told us to japan, Which Was Not True