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A.Canada
B.null Canada
C.Canada null
D.Canada Canada
E.Compilation fails due to an error on line 26.
F.Compilation fails due to an error on line 29.

A.if line 10 is removed， the compilation succeeds.
B.if line 11 is removed， the compilation succeeds.
C.if line 12 is removed， the compilation succeeds.
D.if line 13 is removed， the compilation succeeds.
E.More than one line must be removed for compilation to succeed.