[OS X TeX] Gobble left

[Peter Pagin]

Hi, all.
Here's a TeX question, I guess. By means of

\def\gobble #1{}

a command \gobble is defined that deletes the next character (or space) 
to the right, or replaces it by whatever one puts between the curly 
brackets in the definition. My question is whether there is a method for 
doing the same to the character to the left, i.e. preceding the 
occurrence of the command.

Thanks.

Peter


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