{HEAD ~ The minimum requirement} for achieving {TAIL ~ a three dimensionally rigid connection} using just three sheet flexures is that no two sheet flexures be coplanar 
{ HEAD ~ The minimum requirement } for achieving { TAIL ~ a three dimensionally rigid connection } using just three sheet flexures is that no two sheet flexures be coplanar
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH