Assertion: signal | /r/HasProperty | useful
Facets:
Source sentences:
text: To be useful, signals must impose more costs on those who use them to send false messages than any gains to be had from lying.
text: The signal can also be useful when a switch to a side suit is not desired, since there are hands in which continuing the original suit or switching to a trump is the right thing to do.
text: The signal can also be useful when a switch to a side suit is not desired, since there are hands in which continuing the original suit or switching to a trump is the right thing to do.