. "a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set"@en-us . "107271478"^^ . . . . "07271478-n"^^ . . "placeholder"^^ . "placeholder"@en-us . . "a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set"@en-us . "0"^^ . "106825453"@en-us . "0"^^ . . . .