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oscillation modes, which are suppressed by a strong magnetic field in the  core, in over 3500 red giant stars. About 20\% of our sample have mode  suppression but this fraction is a strong function of mass. Low-mass red giants, which burned hydrogen in a radiative core, do not posses strong internal magnetic fields. For  intermediate-mass stars (1.6--2.0 $\msun$), \msun),  strong core fields occur in at least 60\%, suggesting that powerful dynamos are very common in the  convective cores of these stars.