It's an easy trip to make from Mahabalipuram and you can stop off to shop in Kanchipuram for silk.
It's a difficult trip and you can't buy silk in Kanchipuram. 
mnli hypothesis: It's a difficult trip and you can't buy silk in Kanchipuram.  premise: It's an easy trip to make from Mahabalipuram and you can stop off to shop in Kanchipuram for silk.