First, {HEAD ~ the openings} 45 are patterned in a mask, which is {TAIL ~ a bendable plate} 
First , { HEAD ~ the openings } 45 are patterned in a mask , which is { TAIL ~ a bendable plate }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL