11. Show that a residue check with the modulus A-2a-1 can detect all errors in a group of a -1 (or fewer) adjacent bits. Such errors are called burst errors of length a -1 (or less). 11. Show that a residue check with the modulus A-2a-1 can detect all errors in a group of a -1 (or fewer) adjacent bits. Such errors are called burst errors of length a -1 (or less)