Byte Manipulation with ldb

• USER(1): (setq flags #b111000111)

• USER(2): (ldb (byte 4 0) flags)

• #b0111 ; lowest (rightmost) four bits

• USER(3): (ldb (byte 4 4) flags)

• #b1100 ; next four bits

• USER(4): (ldb (byte 8 0) flags)

• #b11000111 ; lowest eight bits

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