\def\tb{\lower0.05cm\hbox{$\blacksquare$}\ }
\def\tbt{\lower0.05cm\hbox{\isquare{0.35cm}}\ }
\def\ta{{\lower0.08cm\hbox{\fontsize{22pt}{1em}$\bullet$}}\ }
\def\tat{{\fontsize{10pt}{1em}$\bigcirc$}\ }

\def\isquare#1{\hbox{\vrule width0.5ptheight#1\kern-0.25pt\vbox{\hrule height0.5ptwidth#1\kern-0.5pt\kern#1\hrule height0.5ptwidth#1\kern-0.25pt}\vrule width0.5ptheight#1}}

\def\coloro{blue}
\def\colort{darkgreen}
\def\colorth{darkyellow}
\def\colorf{orange}
\def\colorfi{red}

%% colors
\definecolor{darkgreen}{rgb}{0.0,0.7,0.0}
\definecolor{darkyellow}{rgb}{0.7,0.7,0.0}
\definecolor{orange}{rgb}{0.9,0.45,0.0}
\definecolor{iblue}{RGB}{65,105,225}
\definecolor{ired}{RGB}{220,20,60}
\definecolor{igreen}{RGB}{50,205,50}
\definecolor{ipurple}{RGB}{75,0,130}
\definecolor{iochre}{RGB}{218,165,32}
\definecolor{iteal}{RGB}{51,204,204}
\definecolor{imauve}{RGB}{204,51,153}
