Conversely, and just as usefully, it underlined their differences. Such practices cannot be generalized easily, accurately, or usefully into a global religion of shamanism. This may lead to difficulties in defining classes that could usefully subdivide the data. Tendon must be treated in specific ways to function usefully for these purposes. Learning is complete when examining additional observations does not usefully reduce the error rate. Solvents containing unsaturation absorb at longer wavelengths and can usefully filter out short wavelengths. Many other physical quantities can be usefully thought of as vectors. Perhaps even more usefully, they can be drawn up for each product line or service. Heterocyclic compounds can be usefully classified based on their electronic structure. The range of frequencies an oscilloscope can usefully display is referred to as its bandwidth. She credited Symons with usefully drawing on both traditional anthropology and sociobiology. For satellites, this will also reduce weight, slightly but usefully. Early photographic plates and films were usefully sensitive only to blue, violet and ultraviolet light. The Trinity River, though not usefully navigable, is the major waterway through the city. Chemical elements with usefully high neutron capture cross-sections include silver, indium, and cadmium.