Commute-Duplicate

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Commute: Z←f⍨ R      returns R f R.
Duplicate: Z←L f⍨ R returns R f L.
L and R are arrays.
f is a function.

For example:

      ∘.=⍨⍳4 ⍝ Identity matrix
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
      √+/2*⍨6 2⍴3 4, 5 12, 8 15, 7 24, 20 21, 12 35 ⍝ Pythagorean hypotenuses
5 13 17 25 29 37

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