Some questions about" \tableau{dimension=10}"

[hellotosamwang]

\tableau{#}::Tableau(dimension=10). 
ex:=\tableau{2}{2} \tableau{2}{2}{1}; 
lr_tensor(_);

\ftableau{#}::FilledTableau(dimension=10). 
ex:=\ftableau{0,0}{1,1} \ftableau{a,a}{b,b};
lr_tensor(_);

ex:=\ftableau{1} \ftableau{2} \ftableau{3} \ftableau{4};
converge(ex): 
  lr_tensor(_) 
  distribute(_) ;

In this code, the dimension of the Young tableau is set to 10 via \tableau{dimension=10}, and its shape is defined by \tableau{2}{2}. However, it seems impossible to determine the type of group (SU(N+1)?) from this. I don’t understand the function’s purpose—could you explain it? Thank you.