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   a←  1      + 0j1×1+⎕ct
   b← (1+⎕ct) + 0j1×1+⎕ct×2

   | a - b
1.41308E¯14
   | (|a) - |b
1.42109E¯14

   ⍝  | a - b
1.41421 35623 73095 04880 16887 24209 69807 85697e¯14  
   ⍝  | (|a) - |b
1.41421 35623 73095 04880 16887 24192 02040 90400e¯14