2.3 Big, BIG, ....

<../bigl, /bigr,... for mathltx..>
 \def\:tempc#1{\HCode{\l:brace\string\bigl\space\string#1}}
 \HLet\bigl=\:tempc
 \def\:tempc#1{\HCode{\string\bigm\space\string#1}}
 \HLet\bigm=\:tempc
 \def\:tempc#1{\HCode{\string\bigr\space\string #1\r:brace}}
 \HLet\bigr=\:tempc
 \def\:tempc#1{\HCode{\l:brace\string\Bigl\space\string#1}}
 \HLet\Bigl=\:tempc
 \def\:tempc#1{\HCode{\string\Bigm\space\string#1}}
 \HLet\Bigm=\:tempc
 \def\:tempc#1{\HCode{\string\Bigr\space\string #1\r:brace}}
 \HLet\Bigr=\:tempc
 \def\:tempc#1{\HCode{\l:brace\string\biggl\space\string#1}}
 \HLet\biggl=\:tempc
 \def\:tempc#1{\HCode{\string\biggm\space\string#1}}
 \HLet\biggm=\:tempc
 \def\:tempc#1{\HCode{\string\biggr\space\string #1\r:brace}}
 \HLet\biggr=\:tempc
 \def\:tempc#1{\HCode{\l:brace\string\Biggl\space\string#1}}
 \HLet\Biggl=\:tempc
 \def\:tempc#1{\HCode{\string\Biggm\space\string#1}}
 \HLet\Biggm=\:tempc
 \def\:tempc#1{\HCode{\string\Biggr\space\string #1\r:brace}}
 \HLet\Biggr=\:tempc
-_-_-

<..mathltx plain,fontmath..>+
 \def\:tempc#1{{\HCode{\string\big\string{}\string#1\HCode{\string}}}}
 \HLet\big=\:tempc
 \def\:tempc#1{{\HCode{\string\Big\string{}\string#1\HCode{\string}}}}
 \HLet\Big=\:tempc
 \def\:tempc#1{{\HCode{\string\bigg\string{}\string#1\HCode{\string}}}}
 \HLet\bigg=\:tempc
 \def\:tempc#1{{\HCode{\string\Bigg\string{}\string #1\HCode{\string}}}}
 \HLet\Bigg=\:tempc
-_-_-