Avoiding cross product of lists

[Rob Sargent]

I cannot find an example of supplying two arguments from lists which 
does not result in the cross product of the two lists.
p1 uses c1 c2 c3
p2 uses c4 c7
p3 uses c1 c5 c9

I cannot construct a parallel command which accomplishes the task of 
running my programme J 8 times as:
J p1 c1
J p1 c2
J p1 c3
J p2 c4
J p2 c7
J p3 c1
J p3 c5
j p3 c9
Is there such a construct?