In practice, this may for example mean determining whether {HEAD ~ the card} has sufficient memory for {TAIL ~ the operation} and whether the desired operation is among those permitted by the operator 
In practice , this may for example mean determining whether { HEAD ~ the card } has sufficient memory for { TAIL ~ the operation } and whether the desired operation is among those permitted by the operator
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH