Second class coaches with more conventional 2+2 abreast seating were designated Tourist Standard Open (TSO).
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The majority (95) were built using the same body shell as the Mark 1 SK and TSO.
These vehicles have been designed to accommodate additional passengers beyond those able to be accommodated by the Standard Open-class carriages upon which they are based.
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Luca Passani is an Italian developer and the creator of WURFL (the Wireless Universal Resource FiLe), the de facto standard open source (FOSS) framework for addressing so-called Device Fragmentation (AKA Device Diversity) in
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U3D: an ECMA standard open format for 3D data that supports compression.