Displacing a portion of the YZ movement line allows {HEAD ~ vertical displacement} of {TAIL ~ the platform} to be traversed 
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Displacing a portion of the YZ movement line allows { HEAD ~ vertical displacement } of { TAIL ~ the platform } to be traversed
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH