possibly.js

const [not, definitively] = [Symbol(), Symbol()]

export default const possibly = possibility => premise => alternatively =>
    [premise, ...possibility, definitively].reduce((premise, postulate) => 
        premise === not
      ?
        alternatively
      :
        postulate === definitively
      ? 
        premise
      :
        postulate in premise
      ?
        premise[postulate]
      :
        not
    )

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