swimmer (English)
├── -er (English)
│ ├── -er (Middle English (1100-1500))
│ ├── -eren (Middle English (1100-1500))
│ ├── -or (Old English (ca. 450-1100))
│ └── -ra (Old English (ca. 450-1100))
└── swim (English)
└── swimmen (Middle English (1100-1500))
└── swimman (Old English (ca. 450-1100))
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