chainload scheme

Windows Bootloader ---> Ubuntu (Wubi) GRUB ---> Ubuntu/Arch/SUSE/Debian
## in this case Windows chainloads Wubi's GRUB, and Wubi's GRUB loads my other Linux distros.
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DETAILED:
Windows Bootloader
-------          /--> Wubi's GRUB --\
 \______________/                    \--> Linux distro