Mountain climbers say the most challenging mountains to climb are those, like Everest, that are over 8,000 meters tall.
(those, like Everest; are; over 8,000 meters tall) (Mountain climbers; say; the most challenging mountains to climb are those, like Everest) Context(Mountain climbers say,List([0, 21))):(the most challenging mountains to climb; are; those, like Everest)
Mountain climbers say,List([0, 21))
those, like Everest Mountain climbers the most challenging mountains to climb
are say are
over 8,000 meters tall
the most challenging mountains to climb are those, like Everest
those, like Everest