A binary iconic operator OP has two arguments, X and Y:

OP(X,Y) = (OPm(X,Y), OPi(X,Y))

When there is no mutual dependency, i.e., OPm does not depend on Xi or Yi, and OPi does not depend on Xm or Ym, we can write

OP(X,Y) = (OPm(Xm,Ym), OPi(Xi,Yi))

A unary iconic operator OP has only one argument X:

OP(X) = (OPm(X), OPi(X))

Again, when there is no mutual dependency, we can write

OP(X) = (OPm(Xm), OPi(Xi))