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$PATH duplication issues

If I do echo $PATH I get the following:

/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/usr/local/share/npm/bin:/usr/local/share/python:/opt/X11/bin:/Users/kh/.rvm/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin

This is in my ~/.zshrc file:

export PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/usr/local/share/npm/bin:/usr/local/share/python:/opt/X11/bin:$HOME/.rvm/bin:$PATH

I've had to manually add /usr/local/etc... at the front of this file because homebrew was complaining.

I've searched for all possibles files (I know of) to find where $PATH is being built from. But to no avail. These are

~/.bash_profile
~/.bashrc
~/.profile

Any suggestions.