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create large ISO installation image

I'm looking to create a large ISO installation image.

I will write the image to a large USB stick to use as installation
media.  Therefore, I may as well include all packages.

How do I assemble such an image?

I've read the manpage of build-simple-cdd and am none the wiser; nor
have I managed to find examples online.  I've also looked for .jigdo
files (to use as input to jigdo-lite(1)).