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Use "n-tuple" in a sentence
"Ï [a] to mean that the n-tuple a is in the set defined by Ï."
"Ï (v1, ¦, vn+1) of L and every n-tuple d of elements of X,"
"(The entry on classical logic uses the notation ˜A, s where s is any assignment to all the variables of L that assigns to each variable vi free in Ï the i-th element in the n-tuple a.)"