Instance Variables
Boolean: Red1 touching Red2 (R1R2) = false
Boolean: Red1 touching Red3 (R1R3) = false
Boolean: Red2 touching Red3 (R2R3) = false
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IsColliding(Red2) with (Red3) - Set R2R3 (true)
Else R2R3 (false)
IsColliding(Red1) with (Red2) - Set R1R2 (true)
Else R1R2 (false)
IsColliding(Red1) with (Red3) - Set R1R3 (true)
Else R1R3 (false)
Then you will want to do something like this:
R1R2(true) - Red1.destroy, Red2.destroy, Red3.destroy
(condition) R2R3 (true)
(condition) R1R3 (true)