I have attached a paper below which describes a multi-region method for solving for the wave characteristics around a submerged porous structure. I am struggling to solve the last four equations, (23) - (26), (32) and (33). My equations are indeterminate because of the starting points A(M1+1, q) and B(0, q). If anyone could please give me some insight into how to solve these four equations I would be very appreciative.

Thanks for your time.

Kind Regards,

Alex Wylie.