"pa' que lo sepa" is used for emphasis in informal conversation. It doesn't really mean much more than "you know" in English. Literally - "so that you know".
Cepa, on the other hand, means root, among other things. "Dominicano de pura cepa".
cepa f.
1. botany stump (of a tree)
2. (tronco de la vid) rootstalk
3. (vid) vine, stock
4. figurative (linaje) stock, origin
5. architecture pier, pillar
6. meteorology nucleus of a cloud formation
7. Guatemala , Honduras , Puerto Rico group of trees or plants having a common root
8. Mexico pit, hole
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