This 21-question quiz tests you on your knowledge about what comprises a valid email address. Play this to learn about all sorts of weird things regarding email addresses...
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⎕←⎕ucs 2∘⊥∘⌽¨ ↓7 (⊢⍴⍨⊣,⍨÷⍨∘≢) ⍎¨ '0001011001011100101110000111110', '0111010111011110101111010101101', '1100001100101110001011110011100', '0011100001110111010110001111110111011011'
