Question: What's the Proto-Germanic when the Old English is /d/?
SQL: SELECT "Proto-Germanic" FROM "2-1872124-1" WHERE "Old English" = '/d/';

Question: What's the Proto Germanic when then German is /s/ or /ts/?
SQL: SELECT "Proto-Germanic" FROM "2-1872124-1" WHERE "German" = '/s/ or /ts/';

Question: What's the Dutch when then Old English is /d/?
SQL: SELECT "Dutch" FROM "2-1872124-1" WHERE "Old English" = '/d/';

Question: What's the West Germanic when the German is /s/ or /ts/?
SQL: SELECT "West Germanic" FROM "2-1872124-1" WHERE "German" = '/s/ or /ts/';

Question: What's the Proto-Germanic when the German is /t/?
SQL: SELECT "Proto-Germanic" FROM "2-1872124-1" WHERE "German" = '/t/';