{HEAD ~ Multiple “correct” answers} are integrated into {TAIL ~ the learning system} to allow individualized learning experiences in which navigation through the system is at a pace controlled by the learner 
are integrated into
{ HEAD ~ Multiple “ correct ” answers } are integrated into { TAIL ~ the learning system } to allow individualized learning experiences in which navigation through the system is at a pace controlled by the learner
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL 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