passbook (English)
├── book (English)
│ └── book (Middle English (1100-1500))
│ └── boc (Old English (ca. 450-1100))
└── pass (English)
├── pas (Middle English (1100-1500))
└── passen (Middle English (1100-1500))
└── passer (Old French (842-ca. 1400))
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