Paper: https://arxiv.org/abs/2301.09802
Defined in conat.v.
Defined in colist.v, application to Sieve of Eratosthenes in sieve.v (extracted to extract/sieve/).
Defined in cotrie.v, regular expression test in RE_test.v (extracted to extract/re/).
Defined in cotree.v, weakest pre-expectation semantics in cocwp.v, equidistribution theorem in equidistribution.v.