A process for identifying the original tree, which is a member of a dictionary of labelled ordered trees, by processing a potentially Noisy Subsequence-Tree. In some embodiments, the spring is to pivot the plate from a first configuration to an angular position relative the wall in a second configuration, wherein the at least one of the plurality of gear teeth and the at least one tooth on the rack are fully engaged with one another in both the first configuration and the second configuration. In at least one embodiment, at least one of the first sidewall, first top surface, and label may include a color coding andor other indicia. A time interval \u0394t between an instant in time when the test light pulse is generated and the time the reflected or scattered portion is detected can then be used to determine the location of the fault within the optical fiber.