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- flat
- B4
- Boxer
- opposed
- piston
- boxer
- boxer engine
- boxer twin
- flat twin
- flat-twin
- horizontal
- Flat
- Boxer motor
- flat 4
- flat four
- flat-four
- flat-four engine
- 'boxer' engine
- (horizontally opposed)
- Flat 12
- Flat car
- Flat engine#Boxer engine
- Flat or boxer engine
- H6
- Horizontally Opposed Piston Engine
- Horizontally Opposed engine
- Horizontally flat engines
- Opposed
- \"boxer\" engine
- \"flat\" layout
- boxer 4
- boxer engined
- boxer engines
- boxer twins
- boxer-four
- boxer-style engines
- flat 8
- flat configuration
- flat engine
- flat engines
- flat layout
- flat or boxer configuration
- flat or horizontally opposed engine
- flat six
- flat-4 engine
- flat-6
- flat-six
- horizontally opposed
- horizontally opposed \"Boxer\"
- horizontally opposed engine
- horizontally opposed engines
- horizontally opposed piston engine
- horizontally opposite
- horizontally-opposed
- horizontally-opposed engine
- horizontally-opposed engines
- horizontally-opposed piston engine
- opposed piston engine
- piston-powered
- Horizontally opposed, also known as \"Boxer\" or \"flat\", engines
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