An in-line pipe inspection tool has one or more inspection platforms which are connected to an elongate wheeled trolley by link arms. The composite material is made by laminating a film with an amorphous polymer layer to a prebonded nonwoven web, using a bond pattern different from the pattern on the nonwoven so as to provide loose filaments or fibers between the laminate bond points. The partial word lists are then compiled to obtain phoneme graphs corresponding, respectively, to the partial word lists, and then the obtained phoneme graphs are combined.