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So i'm a little confused about something

Ultima 4 download size: 27 MB
Ultima 4+5+6 download size: 21 MB

How are 3 games smaller then 1 of those games by itself O_o? Is the trilogy missing anything? Thanks for any help.
The free U4 version includes the manual in the download, the trilogy doesn't include manuals.
Also, DOSBox is included only once for the entire trilogy, so even if you take out the manual, the trilogy is not three times as large as Ultima IV alone.