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Comment by tspiteri | Hacker News Reader

And fst and rst allow for composition too:

    caar -> ffst
    cddar -> rrfst

I am disproportionally moved by this elegance.

But that doesn't look as nice.

It would need to have a pronunciation convention before it could catch on.

Instead of (f)irst/(r)est we could use (h)ead _or_ (f)irst and (r)est. Then the pronunciation is just exactly as it is spelled - https://www.youtube.com/watch?v=spefM2OjKp4