Hi Michiel, The Artaria engraving of about 1819 is freely available at IMSLP. This is very beautifully done, a model of excellence. Possibly better than finding the MS because I suspect it contains many corrections.
http://imslp.org/wiki/Piano_Sonata_No.29,_Op.106_(Beethoven,_Ludwig_van) No slur is present over the sequence you referred to. If I were engraving this work, I would be doing it off this edition. The large amount of 'air' in the edition is something I find very important. Andrew
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