[Bug-ddrescue] Started with OS Partition now I would like to add the other two.

[MNComputerGuy]

I'm working on a Dell laptop drive with three partitions:
sda1 Dell Diagnostic
sda2 Recovery Partition
sda3 OS Partition

I started the recovery process on sda3, because I wanted to get at the
important data first.
ddrescue /dev/sda3 /media/sdb1/os.img /media/sdb1/oslog

Now, after having reasonably good results on the OS partition, I would like
to add the other two (sda1 and sda2) to the existing image from sda3, to
create one complete image, which in hindsight I should have done from the
beginning. How can this be achieved?
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