Synonym symmetric relation

[dsenkyr]

Following https://github.com/commonsense/conceptnet5/wiki/Relations#relations-in-conceptnet-5, /r/Synonym is a symmetric relation.

How to reproduce the behaviour

• https://api.conceptnet.io/query?start=/c/en/booking&rel=/r/Synonym&end=/c/en does not return /c/en/reservation
• https://api.conceptnet.io/query?start=/c/en/reservation&rel=/r/Synonym&end=/c/en does return /c/en/booking