The heads are articulatable between a first plurality of relevant orientations in which a first edge of the first head is aligned with {HEAD ~ the first edge} of {TAIL ~ the second head} in a parallel spaced apart relation 
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The heads are articulatable between a first plurality of relevant orientations in which a first edge of the first head is aligned with { HEAD ~ the first edge } of { TAIL ~ the second head } in a parallel spaced apart relation
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH