How many of these pairs are duplicates?

\[\begin{array}{ll}
\text{287465911} & \text{287465911} \\
\text{996.487417} & \text{9964.87417} \\
\text{801122135} & \text{801122315} \\
\text{687889913} & \text{688789913} \\
\text{149182675} & \text{149182675} \\
\end{array}\]