You can't do ...akl-syd-drw-per-syd-sin. Only one trip between syd-drw and per-syd is allowed. You could do any of the following:
akl-bne-drw-per-syd-sin
akl-syd-drw-per-bne-sin
akl-syd-drw-per-sin
akl-syd-per-drw-bne-sin
akl-syd-per-drw-sin
And several other iterations I didn't list.