It turns out, learning enough about Ansi escape codes to implement your own rich terminal interface is not nearly as hard as it may seem initially. With a relatively small number of control commands, you can implement your own rich command-line interfaces, and bring progress to what has been a relatively backward field in the world of software engineering.
implies a_i=0 \quad \forall i. Recall that l_i(x) is 1
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memset(&sa_nl, 0, sizeof(sa_nl));
Tony Jolliffe BBC