Overlap relations

	octave	quatrain	line	s	phr	sestet	tercet
sonneteer
meta
sonnet
octave					octave \| phr
quatrain					quatrain \| phr
line				line \| s	line \| phr
s			s \| line			s \| sestet	s \| tercet
phr	phr \| octave	phr \| quatrain	phr \| line			phr \| sestet	phr \| tercet
sestet				sestet \| s	sestet \| phr
tercet				tercet \| s	tercet \| phr