nnoremap <silent> <Leader><C-h> :SidewaysLeft<CR>
nnoremap <silent> <Leader><C-l> :SidewaysRight<CR>

omap aa <Plug>SidewaysArgumentTextobjA
xmap aa <Plug>SidewaysArgumentTextobjA
omap ia <Plug>SidewaysArgumentTextobjI
xmap ia <Plug>SidewaysArgumentTextobjI