I've been looking at the database file of WALS that one can get at https://dev.livingreviews.org/projects/wals/browser/trunk/wals/devdata.sqlite?format=raw and I have found several features that are not described in the chapter texts anywhere: 81B. Languages with two dominant orders of subject, object, and verb 63 langs SOV or SVO: 26 langs SVO or VSO: 13 langs VSO or VOS: 13 langs SVO or VOS: 8 langs SOV or OVS: 3 langs 90B. Prenominal relative clauses 187 langs Relative clause-Noun (RelN) dominant: 139 langs RelN or NRel: 29 langs RelN or internally-headed: 15 langs RelN or correlative: 3 langs RelN or double-headed: 1 lang 90C. Postnominal relative clauses 613 langs Noun-Relative clause (NRel) dominant: 574 langs NRel or RelN: 29 langs NRel or internally-headed: 8 langs NRel or correlative: 2 langs 90D. Internally-headed relative clauses 59 langs Internally-headed relative clause dominant: 20 langs Internally-headed or RelN: 15 langs Internally-headed or NRel: 8 langs Internally-headed or correlative: 1 lang Internally-headed or double-headed: 1 lang Internally-headed occurs as nondominant type: 10 langs Internally-headed exists: 4 langs 90E. Correlative relative clauses 19 langs Correlative relative clause dominant: 7 langs Correlative or RelN: 3 langs Correlative or NRel: 2 langs Correlative or internally-headed: 1 lang Correlative or adjoined: 2 langs Correlative as nondominant type: 3 langs Correlative exists: 1 lang 90F. Adjoined relative clauses 10 langs Adjoined relative clause dominant: 8 langs Adjoined or correlative: 2 langs 90G. Double-headed relative clauses 4 langs Double-headed dominant: 1 lang Double-headed or RelN: 1 lang Double-headed or internally-headed: 1 lang Double-headed as nondominant type: 1 lang Food for thought. t.