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