This style also eschews optional commas in sentences, including the serial comma. For compactness, derivatives may be indicated by adding indices after a comma or semicolon. Separators such as punctuation (point, comma or other signs) are allowed if needed. However, Hebrew punctuation includes only a regular comma (). The Czech language uses a decimal comma instead of a decimal point. The decimal point is represented by a comma. Omitting the serial comma may create ambiguity. This signal may be used in combination with other signals, preceded by an italicized comma. The ogonek is functionally equivalent to the cedilla and comma diacritic marks. Writers who normally avoid the serial comma often use one when it avoids ambiguity. For example, the first row has two telephone numbers separated by a comma. Ambedker declared in response that he "would not change a comma" of his text. In some circumstances using the serial comma can create ambiguity. The serial comma does not eliminate all confusion. It tempers out the septimal comma but not the syntonic comma.