It's a 2003 S40 BTW

Need help with basic spark plug wiring for an S40 1.9L turbo. It has 2 coils and each coil feeds 2 cylinders. But I lost track of which ones. Does the coil on top of cylinder 4 feed cylinders 4 and 2 or 4 and 1. In other words, which of the coil pairings are correct - cylinders (1 and 4) and (2 and ...