Constant ALT_COPY_LANGUAGE 

pub const ALT_COPY_LANGUAGE: &str = "E::=T +r +l T
S::T -r -l
a::=A +l T -l
a::=T +r A -r
b::=B +l T -l
b::=T +r B -r";

The same copy language as above but showing the placement of the unprounced words