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vim number toggle

```
function! NumberToggle()
if(&relativenumber == 1 && &number == 1)
set number
set norelativenumber
elseif (&number == 1 && &relativenumber == 0)
set norelativenumber
set nonumber
else
set number
set relativenumber
endif
endfunction

nnoremap <leader>l :call NumberToggle()

```