Prevent from closing window

I do not want <C-W><C-C> to close the current window, so my _vimrc
contains:

nmap <C-W><C-C> <Esc>

Unfortunately, this only nullifies <C-W><C-C> if the two keys are
pressed in quick succession. Is there a way to completely prevent
<C-W><C-C> from closing the window? I want only <C-W>C to close the
window. <C-C> should always be to stop doing anything.

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