@Override
	public Pair<L, R> modBeforeStore(int sizeinOffset, AddressSpace space, Pair<L, R> inOffset,
			int sizeinValue, Pair<L, R> inValue) {
		return Pair.of(
			leftArith.modBeforeStore(sizeinOffset, space, inOffset.getLeft(), sizeinValue,
				inValue.getLeft()),
			rightArith.modBeforeStore(sizeinOffset, space, inOffset.getRight(), sizeinValue,
				inValue.getRight()));
	}
Construct a composed arithmetic from the given two

@param leftArith the left ("control") arithmetic
@param rightArith the right ("rider") arithmetic
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/exec/PairedPcodeArithmetic.java