#once #create message.ND.tr %$.EQdelim $$.EN.LPOne thing that you will occasionally needis to be able to get a literal { or } in youroutput, for an expression like.EQ{ "{" a + b "}" } over 2.ENThe way to do this is to place the bracesthat are really to appear ______inside ______quotes,like this:   .EQ   { "{" a + b "}" } over 2   .EN.brThe quotes temporarily turn off the special meaningof the braces so that you can have them printed.The file "Example" has a lot of square brackets init.  Modify them so they are all braces when they areprinted - so they look like this - then type "ready"..pl 1#once #create Ref.LP.EQf"{" x sub 1 ,..., x sub n "}" ~=~ "{" x sub 1 ,..., x sub n "}".EN.pl 1#once #create Example.LP.EQf[ x sub 1 ,..., x sub n ] ~=~ [ x sub 1 ,..., x sub n ].EN.pl 1##once neqn Ref | nroff >X1 &#once neqn message Ref | nroff -T$term %s/tinyms -#userneqn Example | nroff >X2#cmp X1 X2#log#next6.1a 10