vim: toggle between tabs and toggle between buffers

experts:

currently I have a map to quickly switch between 2 tabs:

nmap ,l :exe "tabn ".g:lasttab<CR>

au TabLeave * let g:lasttab = tabpagenr()

it works nice.

but I'm thinking to extend that to another scenario, that if I got only one tab left but still have multiple buffers, the same map will toggle between the last 2 buffers used instead of tabs.

how to archive this ?

thanks.

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