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In page Half Dome:

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Half Dome was originally called "Tis-sa-ack", meaning Cleft Rock in the language of the local Ahwahnechee people. Tis-sa-ack is also the name of the fourth route on the formation, ascended by Royal Robbins and Don Peterson over eight days in October 1969. Tis-sa-ack is the name of a mother from a native legend. The face seen in Half Dome is supposed to be hers.[1][2] Tis-sa-ack is the name of a Mono Lake Paiute girl in the Yosemite Native American legend.[citation needed] John Muir interchangeably used "Tissiack,"[3] "South Dome,"[4] and "Half Dome" in his writings.