Unfortunately the literature often does not distinguish these types properly. They distinguish different temporal patterns and learn them. There is some question as to whether these mothers can distinguish which young are theirs. Many European languages do not distinguish clearly between the two. Bias arises from various processes that are sometimes difficult to distinguish. The nomenclature does not distinguish these situations. Translations into other languages often do not distinguish these two groups. It therefore did not distinguish between who is buying whom. These scholars did not distinguish between each other. Olingos are similar enough in appearance that many native cultures do not distinguish the two. Others do not distinguish the subtaxa. However, chromatographic techniques can easily distinguish and measure each of these substances. They often distinguish tangible and intangible property. Nevertheless, one can distinguish three main interpretations. However, human ears can actually distinguish this set of sources.