Function: absdiff	absdiff(0,   +1)	CPT = 12.97
Function: absdiff	absdiff(0,   -1)	CPT = 12.97
Function: absdiff	absdiff(0, a+-1)	CPT = 13.00
Function: absdiff	absdiff(0, r+-1)	CPT = 12.97