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Spelling of Patt/terson ?

The article title has a double 'tt' but the article content has a single 't'. Which is it? Eno Lirpa ( talk) 16:00, 25 February 2016 (UTC) reply

I've just moved the article to single t as the refs support this. Tacyarg ( talk) 20:38, 4 February 2019 (UTC) reply