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Allow One Answer Per Column in Radio Button Grid

1. Who's who?

Space Cell	Batman	The Flash	Superman	Green Lantern	Spider Man
Bruce Wayne	Bruce Wayne: Batman	Bruce Wayne: The Flash	Bruce Wayne: Superman	Bruce Wayne: Green Lantern	Bruce Wayne: Spider Man
Peter Parker	Peter Parker: Batman	Peter Parker: The Flash	Peter Parker: Superman	Peter Parker: Green Lantern	Peter Parker: Spider Man
Barry Allen	Barry Allen: Batman	Barry Allen: The Flash	Barry Allen: Superman	Barry Allen: Green Lantern	Barry Allen: Spider Man
Lex Luthor	Lex Luthor: Batman	Lex Luthor: The Flash	Lex Luthor: Superman	Lex Luthor: Green Lantern	Lex Luthor: Spider Man
Clark Kent	Clark Kent: Batman	Clark Kent: The Flash	Clark Kent: Superman	Clark Kent: Green Lantern	Clark Kent: Spider Man
Foghorn Leghorn	Foghorn Leghorn: Batman	Foghorn Leghorn: The Flash	Foghorn Leghorn: Superman	Foghorn Leghorn: Green Lantern	Foghorn Leghorn: Spider Man
Hal Jordan	Hal Jordan: Batman	Hal Jordan: The Flash	Hal Jordan: Superman	Hal Jordan: Green Lantern	Hal Jordan: Spider Man