There are some tags I've run across that aren't incorrect but are essentially duplicates. So far, it's alternate spellings. For example, there's sikieiki_yamaxanadu and shikieiki_yamaxanadu. I also came across this with hinanai_tenshi and hinanawi_tenshi. I re-tagged the "hinanai" pictures with "hinanawi" since there was less and only later thought about aliasing. How are tags aliased and is it done on an administrative level?