Converting a grid to a list

I have a lovely summary grid of groups and what projects each is involved in.

Now the request is an individual list for each group, listing only their projects.

Example grid:
Project A Project B Project C
G1 X X
G2 X X
G3 X

I can create the list easily enough with an IF..THEN statement, but I'd get blank lines
for the projects that are "skipped" in each row...

Thanks!