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pnmcat -jleft -tb \
<(pngtopnm image139.png) \
<(pngtopnm image73.png) \
| pnmtopng \
-alpha <(pnmcat -black -jleft -tb \
<(pngtopnm -alpha image139.png) \
<(pngtopnm -alpha image73.png) \
) \
>test.png
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