multi case function in latex code example

Example: multi case function in latex

\documentclass{article}
\usepackage{amsmath}
\usepackage{multirow}

\begin{document}
  \[
    X(m,n) = \left\{\begin{array}{@{}lr@{}}
        \multirow{2}{*}{x(n),} & \text{for }0\leq n\leq 1\\
                               & \text{or }0\leq n\leq 1\\
        x(n-1), & \text{for }0\leq n\leq 1\\
        x(n-1), & \text{for }0\leq n\leq 1
        \end{array}\right\} = xy
  \]
\end{document}