Examples: smokeless factory stacks smokeless fuel a smokeless environment
smokeless (English)├── -less (English)│ └── -leas (Old English (ca. 450-1100))│ └── leas (Old English (ca. 450-1100))└── smoke (English) └── smoke (Middle English (1100-1500)) └── smoca (Old English (ca. 450-1100))
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