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House numbering / Finland information is incorrect or incomplete
In Finland houses do not have *numbers*, street numbers are for *estates* not *houses*. Estates have numbers and sometimes with letter suffix. Buildings have letters. The infill information on wiki page incorrect.

A Finnish address consists of 4 parts of which 2 first are mandatory and always present: 1) Street name: Mandatory, alpha-numeric (Latin-1) 2) Estate number: Mandatory, Estate number is separated by space from street name and starts with number and might have *lowercase* suffix, no spaces. For example "12c". Sequential number that may be changed with suffix by the infill system. 3) Building ID: Mandatory *IF* estate has multiple addressed buildings. Omitted if only one or less buildings with one addresses entrances. This is UPPERCASE letter that is separated by space from the Estate number. 4) Entrance number: If the building has multiple addressed entrances these are identified with sequential number separated by space. If there is an entrance number then the Building ID is also required and assigned, defaulting to A.

When a street is created it gets a name. And all the estates/plots along the street are assigned sequential number odd numbers one side and even numbers on other side of the street. When buildings are build on estate they are assigned a capital case letter in alphabetical order per estate. If estate only has one house the building ID is not assigned, if second house is build the first house assigned ID 'A'. If house has multiple addressed entrances those are assigned sequential number then also the building is assigned ID even if there are no other buildings.

When estate is split into multiple new estates these estates need new numbers and there is no room to grow in the assigned sequential numbering that defines the estate location. You can not add a second number between 11 and 13. To prevent having to re-number all the estates on the street there is a infill system. In the infill system the original estate number ceases to exist and is replaced by original number with lower case letter suffix in alphabetical order, when split estate 12 becomes estates 12a and 12b. And there no longer is estate or street number 12. In most cases this works great as most cases estates are split by buildings. Like if estate 12 with houses A,B,C is split to separate estates for each house it becomes estates "12a", "12b", "12c" building ID are removed as they become only house on their estate this keep the address compatible "12 B" just becomes "12b". This is by far the most common case so that most Finns even do not know the difference between "12b" and "12 B" But in some cases this may change the building IDs. For example if estate 12 with houses A,B,C splits the land with house A into separate estate, it becomes estate 12a with single house with no ID and estate 12b with houses A,B. So "12 A" -> "12a", "12 B" -> "12b A" and "12 C" -> "12b B". It cases where estate is split by houses this is much easier as the new estate number suffixes match the building IDs.

The infill system is not needed adding houses or entrances the infill is not needed as their sequence is open ended it can keep growing freely.