Revert "More typos"

This reverts commit 7f657dd22ac20d22698c53b23f0057e1a12c09b7.
Caches matrix inverse

This program takes the data in the form of a vector, converts it into a
square matrix, gets its inverse and caches it. If same matrix
is again given, it takes the inverse from cached data rather than
re-computing  it.