After {HEAD ~ edge} 23 is secured to glue flap 24, the left and right edges of {TAIL ~ the blank} 21 are pushed toward each other so that the sides 18 of the first container 11 move away from each other 
After { HEAD ~ edge } 23 is secured to glue flap 24 , the left and right edges of { TAIL ~ the blank } 21 are pushed toward each other so that the sides 18 of the first container 11 move away from each other
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH