x1   ← ?1e6⍴120
x2   ← ?1e6⍴32000
x4   ← ?1e6⍴2e9
x4s1 ← 5e8+x1
x4s2 ← 5e8+x2

cmpx '⍋'      ∘,¨ 'x1' 'x4s1' 'x2' 'x4s2' 'x4'
cmpx '{⍵[⍋⍵]}'∘,¨ 'x1' 'x4s1' 'x2' 'x4s2' 'x4'
cmpx '⍳⍨'     ∘,¨ 'x1' 'x4s1' 'x2' 'x4s2' 'x4'