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They did not work on TZ, but on sprints. This work takes longer, but is well suitable for compelling customers, allows you to monitor and direct the course of work.
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There was confusion in the structure of the work: I first wanted a prototype, and then a model. The opposite resulted, Alexey smoothly discounted / gave / made the models, the prototype left for later.
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Some directions were missed.
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The main slogan of response: I will address more