Sentence 1: Navigation is hindered by sandbars at the mouth and rapids upriver, though small, sea-going vessels can make fair headway up the Rejang in Sarawak and up the Kinabatangan in Sabah.

Sentence 2: Vessels of any size can go up the Rejang.
OPTIONS:
*yes
*it is not possible to tell
*no
Is this second sentence entailed by the first sentence?
no