Door stimulates ideas about path but needs to reference clear if the topic is passage.
Door stimulates ideas about blocking but needs to reference section if the topic is barrier.

A passage is both a clear and a path.
A barrier is both a section and a blocking.

q1r stimulates ideas about q1s but needs to reference q1o if the topic is q1n.
q1r stimulates ideas about q1s but needs to reference q1o if the topic is q1n.

A q1n is both a q1o and a q1s.
A q1n is both a q1o and a q1s.