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    UIUA well..

    a  = /+"G":/+"R".x
    b  = /+"Y":/+"B".x
    c  =0/+=0⊂≥¯1:1.\++¯⌕"G":"R".x
    d  =0/+=0⊂≥¯1:1.\++¯⌕"Y":"B".x
    Sol  ("False"|"True")=0/+0[a b c d]