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f/x   (⊃⌽f\x)
  f: ⍱ ⍲ < > ≤ ≥
 
-\x   (+\x×(⍴x)⍴1 ¯1)
÷\x   (×\x*(⍴x)⍴1 ¯1)



   x← * 2 7 1 8 2 8
   (-\x) - +\x×(⍴x)⍴1 ¯1
0 0 0 0 0 ¯9.09495e¯13
   (÷\x) - ×\x*(⍴x)⍴1 ¯1
0 0 0 ¯8.47033e¯22 ¯6.77626e¯21 ¯3.30872e¯24