The "external path length" is the sum of the lengths of all unique external paths. The "internal path length" is the sum of the lengths of all unique internal paths. There are more than of bicycle paths, lanes and bike routes in the city. There are of cycle paths and routes in Paris. Over of paved bike paths are available in Yosemite Valley. He paid particular attention to the introduction of cycling lanes on pedestrian paths. Multipath routing techniques enable the use of multiple alternative paths. Multiple playthroughs can result in different paths and different digivolutions. Strings of packhorses travelled along a network of bridle paths. Some radionuclides may have several different paths of decay. The nonrelativistic formulation is traditionally given in terms of particle paths, not fields. Covering , it contains a series of winding paths. Thus, symlinks with short target paths are accessed quickly. People strolled and children played along its stony paths. Many other mean free paths can be defined.