At step 25, {HEAD ~ the ACS} 1050 assesses {TAIL ~ risk level} and presents challenge for high risk transactions 
assesses
At step 25 , { HEAD ~ the ACS } 1050 assesses { TAIL ~ risk level } and presents challenge for high risk transactions
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH