{HEAD ~ These compounds} may be in {TAIL ~ a crystalline state} having metallic cations of two different valences, or electronic states, in the inorganic crystal 
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{ HEAD ~ These compounds } may be in { TAIL ~ a crystalline state } having metallic cations of two different valences , or electronic states , in the inorganic crystal
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH