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, C) acquire a second meaning within the multivector formalism of the Clifford algebra discussed in [6]. Here two of the basis vectors are isotropic vectors, which can be considered as representing oriented planes and defining complete triads. These interpretations are of no use here because our spinors ? ? and ? ? must represent states of spinning motion, Note that the basis vectors ? ? ? ? ? ? , with (?,?) ? {?,?} 2 of M