Overlap relations

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