Assertion: sonnet's problem | /r/HasProperty | advanced by the octave
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Source sentences:
text: According to Paul Fussell, "The standard way of constructing a Petrarchan sonnet is to project the subject in the first quatrain; to develop or complicate it in the second; then to execute, at the beginning of the sestet, the turn which will open up for solution the problem advanced by the octave, or which will ease the load of idea or emotion borne by the octave, or which will release the pressure accumulated in the octave.