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[x]s

Definitions:

  The binary representation of the non-negative integer x, in s bits, where x<2s.
Sources:
NIST SP 800-38C

  The binary representation of the non-negative integer x as a string of s bits, where x<2s.
Sources:
NIST SP 800-38D

  The binary representation of the non-negative integer x as a string of s bits, where x < 2s.
Sources:
NIST SP 800-38F