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points

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@dang, pleaaase can we get proper markdown formatting on HN? I tried adding two spaces after each line, but I don't want paragraphs between code

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4 spaces indent

The inversion is really cool, e.g.

    > f = λa λb concat ["Hello ", a, " ", b, "!"] 
    > f "Jane" "Doe" 
    Hello Jane Doe!

then,

    > g = f "Admiral" 
    > invert g "Hello Admiral Alice!" 
    Alice