occurs>100
"IQB" not in ion
"IVD" not in ion
"IRE" not in ion
"IRB" not in ion
"ICA" not in ion
"IWB" not in ion
"IRD" not in ion
((len(ion.split("+")[0].split("-")[0])==3)&(ion[0]=="I")&("+" in ion))==False