To use photographs in a digital collage for a paid commission, the illustrator should look for photographs that are under the following Creative Commons licenses:
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CC BY - This license allows for commercial use as long as appropriate credit is given to the creator.
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CC BY-ND - This license allows for commercial use as well, but the work must not be altered in any way.
Both of these licenses permit the use of the photographs for commercial purposes, which is essential for the illustrator's commission for a newspaper. Therefore, the correct answers are CC BY and CC BY-ND.