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AAny (any atom except hydrogen)
AHAny atom, including hydrogen
QHetero (any atom except hydrogen and carbon)
QHHetero atom or hydrogen (any atom except carbon)
MMetal (contains alkali metals, alkaline earth metals, transition metals, actinides, lanthanides, poor(basic) metals, Ge, Sb and Po)
MHMetal or hydrogen
XHalogen (F,Cl,Br or I)
XHHalogen or hydrogen