Verified answer

[tex]\small \color{lime}{ \tt T.}\small \color{blue}{ \tt H.}\small \color{magenta}{ \tt X.}[/tex]

[tex] \color{black}\begin{gathered}\begin{gathered}\small  \\ \colorbox{red}{\boxed{ \rule{1pt}{999999pt}}}\colorbox{orange}{\boxed{ \rule{1pt}{999995pt}}}\colorbox{yellow}{\boxed{ \rule{1pt}{999999pt}}}\colorbox{green}{\boxed{ \rule{1pt}{999995pt}}}\colorbox{blue}{\boxed{ \rule{1pt}{999999pt}}}\colorbox{magenta}{\boxed{ \rule{1pt}{999995pt}}}\colorbox{purple}{\boxed{ \rule{1pt}{999999pt}}}\end{gathered}\end{gathered}  [/tex]