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Allow One Answer Per Column in Radio Button Grid

1. Who's who?

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