Thank you, Luigi, for excellent snippet! )
\unprotect
%%big 1.5
%%medium 1.25
%%small 1.0
%%
%%bbig 1.75
\def\v!bbig{bbig}
\long\def\OneandSevthirdofthreearguments #1#2#3{1.75}
\letvalu...@av@\v!bbig }\OneandSevthirdofthreearguments
%%Big 2.0
\def\v!Big{Big}
\long\def\Twothirdofthreearguments #1#2#3{2.0}
\letvalu...@av@\v!Big }\Twothirdofthreearguments
\protect
Regards,
Vyatcheslav
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