The lords of the three dusthanas (6th, 8th, 12th) placed in one another's houses - that is, in a dusthana. Phaladeepika ch. 6 names the three forms: Harsha (6th lord in a dusthana while the 6th is occupied or aspected by malefics), Sarala (8th lord in the 6th, 8th or 12th) and Vimala (12th lord in a dusthana, aspected by or conjoined with malefics).
The evil of the dusthana turns into good: Harsha gives happiness, enjoyment, good fortune and a strong constitution, and victory over enemies; Sarala gives long life, resolution, learning, children and riches; Vimala gives frugality, independence, a respectable profession and a good name.
Viparita means inverted, and the doctrine is that a malefic house badly placed can produce good when its lord is placed in another malefic house: the harm is turned inside out. It is one of the clearest cases of the tradition's habit of reading affliction as a resource rather than as a verdict.
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