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What does the 'a' and x^254 in code means?

sage: R.<x>=GF(2^8,'a')[]

sage: from sage.crypto.boolean_function import BooleanFunction

sage: B = BooleanFunction( x^254 ) # the Boolean function Tr(x^254)

sage: B

What does the 'a' and x^254 in code means?

sage: R.<x>=GF(2^8,'a')[] R.<x>=GF(2^8,'a')[] sage: from sage.crypto.boolean_function import BooleanFunction BooleanFunction sage: B = BooleanFunction( x^254 ) # the Boolean function Tr(x^254) Tr(x^254) sage: BB