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You should wait until pub.getNumSubcribers() > 0 before you exit your program in a while loop.

You should wait until pub.getNumSubcribers() > 0 in a while loop before you exit your ~~program in a while loop.~~program.

You should wait until pub.getNumSubcribers() > 0 in a while loop before you ~~exit~~ send your ~~program.~~message.

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