12 using lal_char_zr = context<lal_char, vcsn::expressionset<lal_char_z>>;
context< lal_char, vcsn::z > lal_char_z
context< lal_char, vcsn::expressionset< lal_char_zr >> lal_char_zrr
context< lal_char, vcsn::expressionset< lal_char_z >> lal_char_zr
VCSN_CTX_INSTANTIATE(ctx::lal_char_b)