Assertion: yeti's friend | /r/CapableOf | nod at each other
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Source sentences:
text: Rollason then proceeds to summarise what were indeed the prevailing ideas about the height, weight and body-structure of the Yeti: a dissertation which causes Friend and Shelley to nod at each other, and reveal what they’re really doing in the Himalayas: not merely proving the existence of a Yeti, but trying to catch one for exploitation.