in X and Y are handled; and in how the full test is done6 D. J. Bernstein, T. Lange, C. Peters, P. Schwabe once a choice was successful on the ? positions. The most recent papers are [5], [16], and =-=[6]-=-; see those papers for surveys of previous work. 3 The Augot–Finiasz–Sendrier algorithm for 2-regular decoding This section discusses the Augot–Finiasz–Sendrier algorithm [2, Section 4.2] for 2-regula