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\newenvironment{nam}[args]{begdef}{enddef} \renewenvironment{nam}[args]{begdef}{enddef}

These commands define or redefine an environment.

Changes in LaTeX2e

It is possible to have an optional argument, the form of the command being
If opt is present, the first of the args arguments is optional with default value opt. If it is absent all arguments are mandatory.
See also Defining commands, Environments
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Revised: Sheldon Green, 16 Nov 1995.