p          3          Assign parameter

q                     Unassigned

r          17         String resolution

s          16         stop

t          13         Branch TRUE

u                     Unassigned

v          10         Modulus

w          18         Machine code

x          10         Real Exponentiation

y          16         Diagnostic Control

z          16         Control Information

{          3,6        Start of formal parameters

}          3,6        End of formal parameters