Thus, within a character, each bar 16 may consist of {TAIL ~ 1, 2, 3 or 4 contiguous dark modules}, and each space 18 may consist of 1, 2, 3 or 4 contiguous white modules, so long as the total width of the character is {HEAD ~ 7 modules} 
Thus , within a character , each bar 16 may consist of { TAIL ~ 1 , 2 , 3 or 4 contiguous dark modules } , and each space 18 may consist of 1 , 2 , 3 or 4 contiguous white modules , so long as the total width of the character is { HEAD ~ 7 modules }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD