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if'': x or'' # valid string-keyword no-space combinations
async def f(): await g()
# All valid prefixes for unicode and byte strings should be colored.
'x', '''x''', "x", """x"""
r'x', u'x', R'x', U'x', f'x', F'x'
fr'x', Fr'x', fR'x', FR'x', rf'x', rF'x', Rf'x', RF'x'
b'x',B'x', br'x',Br'x',bR'x',BR'x', rb'x', rB'x',Rb'x',RB'x'
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