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131Topicity — Main article: stereochemistry In chemistry, topicity is the stereochemical relationship of substituents relative to the structure to which they are attached. Depending on the relationship, such groups can be heterotopic, homotopic, enantiotopic,… …
132List of mobile phone codes by country — In many countries, mobile phones are assigned dedicated mobile phone codes within the country s telephone numbering plan. Some countries that do not use area codes (e.g. Singapore) allocate specific number ranges to mobile phones that are easily… …
