removed the deprecated subset method
removed the deprecated subset method

Titan-C/sympy,aktech/sympy,kaichogami/sympy,aktech/sympy,souravsingh/sympy,Curious72/sympy,yashsharan/sympy,jaimahajan1997/sympy,yashsharan/sympy,mafiya69/sympy,sampadsaha5/sympy,jerli/sympy,ChristinaZografou/sympy,postvakje/sympy,postvakje/sympy,skidzo/sympy,madan96/sympy,souravsingh/sympy,lindsayad/sympy,madan96/sympy,hargup/sympy,jerli/sympy,rahuldan/sympy,hargup/sympy,sampadsaha5/sympy,Curious72/sympy,kaushik94/sympy,jerli/sympy,chaffra/sympy,Titan-C/sympy,rahuldan/sympy,chaffra/sympy,drufat/sympy,madan96/sympy,chaffra/sympy,ChristinaZografou/sympy,hargup/sympy,Curious72/sympy,Arafatk/sympy,kaushik94/sympy,postvakje/sympy,yashsharan/sympy,ChristinaZografou/sympy,aktech/sympy,rahuldan/sympy,mafiya69/sympy,Titan-C/sympy,lindsayad/sympy,kaushik94/sympy,kaichogami/sympy,Arafatk/sympy,jaimahajan1997/sympy,skidzo/sympy,sampadsaha5/sympy,mafiya69/sympy,lindsayad/sympy,drufat/sympy,Arafatk/sympy,kaichogami/sympy,jaimahajan1997/sympy,souravsingh/sympy,skidzo/sympy,drufat/sympy