BM算法找出产生该段序列的最短级数的线性反馈移位寄存器（LFSR)，如对序列a=(1001101011),结果为LFSR(25,4)即周期为25，寄存器级数为4，此处所给为固定长度。-Using BM algorithm to find the linear feedback shift registers with the least steps corresponding to certain sequence. For example, as for a=(1001101011), the