{HEAD ~ The block back legs} may extend in a plane parallel to {TAIL ~ the block front surface} or extend forwardly toward the blocks front surface 
{ HEAD ~ The block back legs } may extend in a plane parallel to { TAIL ~ the block front surface } or extend forwardly toward the blocks front surface
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH