Add the example 5.4 from Derek Holt
Add the example 5.4 from Derek Holt

kaushik94/sympy,rahuldan/sympy,drufat/sympy,madan96/sympy,jaimahajan1997/sympy,yashsharan/sympy,drufat/sympy,rahuldan/sympy,chaffra/sympy,kaushik94/sympy,yashsharan/sympy,jaimahajan1997/sympy,rahuldan/sympy,skidzo/sympy,souravsingh/sympy,yashsharan/sympy,sampadsaha5/sympy,aktech/sympy,madan96/sympy,sampadsaha5/sympy,skidzo/sympy,skidzo/sympy,kaushik94/sympy,chaffra/sympy,souravsingh/sympy,aktech/sympy,jaimahajan1997/sympy,aktech/sympy,madan96/sympy,postvakje/sympy,sampadsaha5/sympy,drufat/sympy,souravsingh/sympy,postvakje/sympy,postvakje/sympy,chaffra/sympy