CREATE TABLE table_66290 ("Proto-Germanic" TEXT, "West Germanic" TEXT, "Old English" TEXT, "German" TEXT, "Dutch" TEXT)

What's the West Germanic when the German is /s/ or /ts/?
SELECT "West Germanic" FROM table_66290 WHERE "German" = '/s/ or /ts/'
SELECT "West Germanic" FROM "table_66290" WHERE "German" = '/s/ or /ts/'