a← 1 + 0j1×1+⎕ct b← (1+⎕ct) + 0j1×1+⎕ct×2 x←(a,b)[?1000⍴2] y←(a,b)[?1000⍴2] a=b 1 x⍳y 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ... x {⍳⍨ ⍉cluster⍤1⍉ |⍵} HASH y 1 1 0 1 1 1 0 1 0 0 1 0 1 0 1 1 1 0 0 1 ...