517 This is the joint trellis of two trellises described in awgn1o2_16.fsm
518 It is useful for application of joint decoding...
519 It can be generated in python as follows:
521 > f1=trellis.fsm('awgn1o2_16.fsm')
522 > f=trellis.fsm(f1,f1)
523 > f.write_fsm_txt('joint_16_16.fsm')