Exercise 2: What Would Go Wrong With Debian → Fedora → Windows Install Order — Possible Solution
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Explanation:

This order directly violates the chapter's own Step 2 rule ("every
uncooperative OS first, Linux/GRUB last"), installing Windows -- the
one genuinely uncooperative OS in this three-way mix -- LAST instead
of first. Per grub1-6's own material, Windows's installer "is not
cooperative about detecting other operating systems and will happily
overwrite the boot sector or EFI boot entries without asking." If
Windows is installed after both Debian and Fedora already have GRUB
controlling the boot process, Windows's own installer would very
likely reset itself as the primary UEFI boot entry (or overwrite the
relevant boot configuration on a BIOS system), with no awareness that
Debian's GRUB was previously in charge.

The direct consequence for Step 3's own confirmation step: instead of
seeing the expected three-entry menu (Debian's native kernels, a
Fedora chainload entry, a Windows chainload entry), the system would
most likely boot straight into Windows with NO GRUB menu at all --
essentially the exact same symptom grub1-6's own "Windows Update
breaks GRUB" gotcha describes, except triggered by the Windows
INSTALLER itself rather than a later update. Both Debian's and
Fedora's own presence on the disk would still exist, but neither would
be reachable from the boot menu without the same grub1-9-style rescue
procedure this chapter's own Step 6 already demonstrates being needed
to fix it.

WHY THIS WORKS AS AN ANSWER
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This identifies the specific rule being violated (uncooperative-OS-last
instead of first) and predicts the concrete resulting symptom (no menu
at all, booting straight to Windows) by directly applying grub1-6's
own stated installer behavior, rather than a vague "it would break
somehow."