{HEAD ~ The next step} comprises folding each of the first slotted partitions along {TAIL ~ its folding axis} 
{ HEAD ~ The next step } comprises folding each of the first slotted partitions along { TAIL ~ its folding axis }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL