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phenomenon
something seen at parties
something else seen at parties
astronomical phenomenon
gemstone
material also called "mother of pearl"
liquid
Aztec god
element
optical illusion/puzzle
this U.S. national park's Gran Prismatic Spring
light when shone through one of these
some species of this insect
type of glass
optical instrument
Zhangye Danxia in this country
this flag
Dallol in this country