1:      1  1 CALL pred multi_parameter:main/2-0 (det) 
mdb> echo on
Command echo enabled.
mdb> 
       2:      2  2 CALL pred multi_parameter:foo/2-0 (det) 
mdb> print *
       HeadVar__1           		'z'
mdb> 
       3:      3  3 CALL pred multi_parameter:a/2-0 (det) 
mdb> print *
       HeadVar__1           		'z'
mdb> 
       4:      4  4 CALL pred multi_parameter:Introduced_pred_for_multi_parameter__m__character__arity0__int__arity0______multi_parameter__a_2/2-0 (det) 
mdb> print *
       HeadVar__1           		'z'
mdb> 
       5:      5  5 CALL pred char:to_int/2-0 (det) 
mdb> print *
       Character            		'z'
mdb> 
       6:      5  5 EXIT pred char:to_int/2-0 (det) 
mdb> print *
       Character            		'z'
       Int                  		122
mdb> 
       7:      4  4 EXIT pred multi_parameter:Introduced_pred_for_multi_parameter__m__character__arity0__int__arity0______multi_parameter__a_2/2-0 (det) 
mdb> print *
       HeadVar__1           		'z'
       HeadVar__2           		122
mdb> 
       8:      3  3 EXIT pred multi_parameter:a/2-0 (det) 
mdb> print *
       HeadVar__1           		'z'
       HeadVar__2           		122
mdb> continue -S
122