u←(' ',⎕a,⎕d)[?8e4 30⍴37]
   x←u[?1e5⍴≢u;] ⋄ c←,⊂x
   y←u[?1e5⍴≢u;] ⋄ d←,⊂y

   cmpx 'c(8⌶)d' 'x⍳y'
c(8⌶)d → 9.53e¯3 |    0% ⎕⎕⎕⎕
x⍳y    → 4.56e¯2 | +378% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕

   cmpx 'c(8⌶)c' 'x⍳x'
c(8⌶)c → 4.05e¯3 |    0% ⎕⎕
x⍳x    → 4.44e¯2 | +996% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕