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tromp 7 hours ago

You can enter (λn.n(λc.λa.λb.cb(λf.λx.f(afx)))Fn0)7 to compute the function Col' from [1] to 7, resulting in (3*7+1)/2 = 11. Unfortunately, this visualization is much less insightful than showing the 7 successive succ&swap operations:

     7  0
     0  8
     8  1
     1  9
     9  2
     2 10
    10  3
     3 11
[1] https://news.ycombinator.com/item?id=46022965