Shows exactly 3 hearts.
Shows 4 hearts.
Shows 6+ hearts and denies as many as 3 spades. Making a support double is opener's first priority.
Responder's rebids are natural.
If the opponents' interference is in the form of a double, a redouble by opener can be used to show 3-card support. This of course is called a support redouble.
Support doubles are on through all competition up to and including 2.
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