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As stated in the gts help file, the argument characters only supports 2-way interactions of grouping variables and it assumes to create all the possible combinations. There are 4 groups specified in that case and doesn't exist some combinations. Currently I don't have know how to create a limited grouping matrix beyond 3 levels based on the given (and restricted) characters.
See
http://stackoverflow.com/q/40729669/144157
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