{HEAD ~ The engagement portions} are engaged with {TAIL ~ the latch portions} so that the holder arm is kept in an expanded state 
are engaged with
{ HEAD ~ The engagement portions } are engaged with { TAIL ~ the latch portions } so that the holder arm is kept in an expanded state
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH