It is not like 2 tone.
It is also called decimal digital with 11 tones,, one for each digit from 0 to 9, and a "R" tone so you can have repeated numbers.
It is also called 5/6 tone as the last tone was optional and I think helped with grouping, but it has been about 20 years since I had to know what I was talking about on the topic.
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