HKCEE 2009 Paper 2 Q38, DSE 2015 Paper 1A Q36, DSE 2019 Paper 1B Q1(a), DSE 2012 Paper 1B Q1, HKCEE 2002 Paper 2 Q27, DSE 2014 Paper 1B Q2, HKCEE 2003 Paper 2 Q48, HKCEE 2008 Paper 2 Q21, DSE PP Paper 1A Q26, HKCEE 2006 Paper 2 Q12, HKCEE 2001 Paper 2 Q60