Assertion: yeti | /r/AtLocation | certain isolated valleys
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Source sentences:
text: He follows up by outlining his belief, which coincides with Rollason’s own, that the Yeti may be found in certain isolated valleys, and that winter is the time to seek them, when they are forced down the mountains and into restricted territory in order to find food; and that a small party, which won’t frighten them off, is the way to search.