i=0
while s[i:i+1]==' ':
i=i+1
s=s[i:]
i=len(s)
while s[i-1:i]==' ':
i=i-1
s=s[:i]
return s
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i=0
while s[i:i+1]==' ':
i=i+1
s=s[i:]
i=len(s)
while s[i-1:i]==' ':
i=i-1
s=s[:i]
return s