2022.11.30 Like you, I also found some similarities between Basic and Central Luzon.  I identified 12 possible shared innovations though I admit they’re pretty tenuous being mostly minor phonological items: *?ah ’not’ [neg] | Could I have the data? I have Itbayaten ah, what else is there? My ZDS has => PNP *aR (with *R > g in several) *?asel ‘foot, calf’ ??? | Could I have the data? *buklas ‘morning’ ok ZDS ~'tomorrow'YES! I had this *?a?sung ‘mortar’ ??? | Could I have the data? *mu ‘only’ ??? | Could I have the data? *muRa ‘anger’ ??? | Could I have the data? *ngepen ’tooth’ ??? | Weakening of *i in penult? *tapi? floor, covering’ => Sorry, PPH *tapiq [ACD] *t/ar/ine{kng] ’straight’ YES! ZDS *tarineng THANKS! *?ubid ‘rope, string’ ??? | Loss of initial *l? *?uya ’this’ | Could I have the data? I’m not supplying the supporting data here since you probably have it anyway.  My supporting data are in FileMakerPro, so that wouldn’t help you. Botolan matoynung 'straight' Ivatan matalineng Itbayaten matarineng