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colume a=value, colume b is notation with s1, s2, s3, and s4 according to the
type of values in colume a.
I want to add only values that was notated with s1 in colume b, but omitting
that was mark with "x" in colume c respectively.
type of values in colume a.
I want to add only values that was notated with s1 in colume b, but omitting
that was mark with "x" in colume c respectively.