Refer to walk as a relation in language reference
Refer to walk as a relation in language reference

open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,open-policy-agent/opa,Eva-xiaohui-luo/opa,tsandall/opa,Eva-xiaohui-luo/opa,tsandall/opa,tsandall/opa,Eva-xiaohui-luo/opa,tsandall/opa,tsandall/opa,open-policy-agent/opa,open-policy-agent/opa,open-policy-agent/opa