The earlier related expression may occupy four positions in a couplet.
PositionLocation
1. First hemistich openingAt the beginning of line one
2. First hemistich interiorWithin line one
3. First hemistich endingAt the end of line one
4. Second hemistich openingAt the beginning of line two
The partner remains at the end of the second hemistich. A full classification needs both position and type of verbal likeness.