basic, most common format. A number with an alphabetic suffix: "", "", etc. This format occurs when a property is numbered 123 but later subdivided into two houses with different addresses. If the house lies on an hẻm/ngõ (alley), the alley number is combined with the house number: for example, in "", 123 is the alley's address, and 3 is the house number on that alley. More complex house numbers may occur on alleys that branch from other alleys or properties on alleys are subdivided, for example "" or "". An extreme example would be "", which is located on 3rd alley off 12th alley off 14th alley off 7th alley off 182nd street. Another scheme is based on residential areas called . A is addressed by house number, road, and , for example "". Some localities still use an older address format based on neighborhood (): for example, in "", 7A is the neighborhood number. This confusing format is being gradually phased out in favor of the more modern formats above. West Asia Generally in Iran and especially in the capital Tehran odd numbers are all on one side and the even numbers opposite along streets. Infrequently, this style confuses people because this is not how it works everywhere in the city and sometimes the numbers get intertwined with each other. In the rural parts, some houses have no number at all and some have their owner's details as the number instead. In some cases, using the number 13 is skipped replacing it with equivalents such as: 12+1 or 14−1. Northern and Western Europe In Europe the most common house numbering scheme, in this article referred to as the "European" scheme, is to number each plot on one side of the road with ascending odd numbers, from 1, and those on the other with ascending even numbers, from 2 (or sometimes 0). The odd numbers are usually on the left side of the road, looking in the direction in which the numbers increase. Where additional buildings are inserted or subdivided, these are often suffixed a, b, c, etc. (in Spain, France and Afragola until 2001, bis, ter, quater, quinquies etc.). Where buildings are later combined, one of the original numbers may be used, the numbers may be combined ("13/15"), or the numbers may be used as a given range (e.g. "13–17"; not to be construed as including the even