If this ticket is not {HEAD ~ a duplicate} at {TAIL ~ block} 228, a charge for the ticket is made by decreasing the money variable by the cost of the ticket 
at
If this ticket is not { HEAD ~ a duplicate } at { TAIL ~ block } 228 , a charge for the ticket is made by decreasing the money variable by the cost of the ticket
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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