function to determine color of next structure adding to planC
function to determine color of next structure adding to planC

aditiiyer/CERR,cerr/CERR,aditiiyer/CERR,cerr/CERR,cerr/CERR,cerr/CERR,aditiiyer/CERR,cerr/CERR,aditiiyer/CERR,aditiiyer/CERR,cerr/CERR,aditiiyer/CERR,cerr/CERR,aditiiyer/CERR,cerr/CERR,aditiiyer/CERR,cerr/CERR