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Convert into lower units:
 
(i) \(15 \ km\) (\(m\), \(cm\), \(mm\))
 
\(m\)
 
\(cm\)
 
\(mm\)
 
(ii) \(12 \ kg\) (\(g\), \(mg\))
 
\(mg\)
 
\(g\)