SERIES A: banker /æ/, stump /ʌ/, bunker /ʌ/, stamp /æ/, hut /ʌ/, hat /æ/

SERIES B: butter /ʌ/ , flutter /ʌ/, butler /ʌ/ , batter/æ/  , bad /æ/ .

SERIES C: rumble /ʌ/, ramble/æ/, shutter /ʌ/ , mashed /æ/, slush /ʌ/ , man /æ/