permutations: restore recursive _af_rmul
permutations: restore recursive _af_rmul

amitjamadagni/sympy,VaibhavAgarwalVA/sympy,Designist/sympy,sahilshekhawat/sympy,kmacinnis/sympy,jbbskinny/sympy,ChristinaZografou/sympy,skidzo/sympy,Vishluck/sympy,Vishluck/sympy,cccfran/sympy,cccfran/sympy,liangjiaxing/sympy,chaffra/sympy,beni55/sympy,souravsingh/sympy,vipulroxx/sympy,Mitchkoens/sympy,lindsayad/sympy,kevalds51/sympy,shikil/sympy,debugger22/sympy,mcdaniel67/sympy,garvitr/sympy,kumarkrishna/sympy,drufat/sympy,yashsharan/sympy,wyom/sympy,kmacinnis/sympy,iamutkarshtiwari/sympy,maniteja123/sympy,shipci/sympy,abloomston/sympy,AunShiLord/sympy,hrashk/sympy,toolforger/sympy,liangjiaxing/sympy,kumarkrishna/sympy,saurabhjn76/sympy,diofant/diofant,debugger22/sympy,mafiya69/sympy,farhaanbukhsh/sympy,meghana1995/sympy,beni55/sympy,wyom/sympy,souravsingh/sympy,MridulS/sympy,jaimahajan1997/sympy,rahuldan/sympy,shipci/sympy,hargup/sympy,Davidjohnwilson/sympy,vipulroxx/sympy,asm666/sympy,abhiii5459/sympy,lindsayad/sympy,kmacinnis/sympy,beni55/sympy,lidavidm/sympy,farhaanbukhsh/sympy,oliverlee/sympy,Mitchkoens/sympy,Shaswat27/sympy,oliverlee/sympy,vipulroxx/sympy,postvakje/sympy,moble/sympy,Designist/sympy,Titan-C/sympy,saurabhjn76/sympy,abhiii5459/sympy,bukzor/sympy,kaichogami/sympy,abloomston/sympy,aktech/sympy,jaimahajan1997/sympy,lidavidm/sympy,atreyv/sympy,Arafatk/sympy,wanglongqi/sympy,ga7g08/sympy,wanglongqi/sympy,Curious72/sympy,madan96/sympy,atsao72/sympy,moble/sympy,kevalds51/sympy,madan96/sympy,hargup/sympy,kevalds51/sympy,skirpichev/omg,pbrady/sympy,yukoba/sympy,rahuldan/sympy,drufat/sympy,atsao72/sympy,bukzor/sympy,garvitr/sympy,saurabhjn76/sympy,wanglongqi/sympy,jamesblunt/sympy,cswiercz/sympy,pbrady/sympy,farhaanbukhsh/sympy,abhiii5459/sympy,AunShiLord/sympy,jerli/sympy,Mitchkoens/sympy,debugger22/sympy,yukoba/sympy,toolforger/sympy,ahhda/sympy,iamutkarshtiwari/sympy,atsao72/sympy,chaffra/sympy,Gadal/sympy,kaichogami/sympy,Curious72/sympy,abloomston/sympy,sahmed95/sympy,maniteja123/sympy,mafiya69/sympy,postvakje/sympy,VaibhavAgarwalVA/sympy,pandeyadarsh/sympy,madan96/sympy,bukzor/sympy,postvakje/sympy,lindsayad/sympy,Gadal/sympy,yashsharan/sympy,dqnykamp/sympy,sahmed95/sympy,Sumith1896/sympy,sampadsaha5/sympy,ahhda/sympy,AkademieOlympia/sympy,AkademieOlympia/sympy,shikil/sympy,cccfran/sympy,emon10005/sympy,atreyv/sympy,MechCoder/sympy,amitjamadagni/sympy,pandeyadarsh/sympy,MechCoder/sympy,garvitr/sympy,sahmed95/sympy,grevutiu-gabriel/sympy,Sumith1896/sympy,chaffra/sympy,sunny94/temp,jamesblunt/sympy,sampadsaha5/sympy,pandeyadarsh/sympy,ChristinaZografou/sympy,meghana1995/sympy,Shaswat27/sympy,sunny94/temp,cswiercz/sympy,MridulS/sympy,jaimahajan1997/sympy,aktech/sympy,jerli/sympy,dqnykamp/sympy,Titan-C/sympy,Sumith1896/sympy,shikil/sympy,Titan-C/sympy,jamesblunt/sympy,jbbskinny/sympy,hrashk/sympy,toolforger/sympy,asm666/sympy,Gadal/sympy,Arafatk/sympy,Curious72/sympy,skidzo/sympy,sampadsaha5/sympy,skidzo/sympy,Arafatk/sympy,AkademieOlympia/sympy,ga7g08/sympy,cswiercz/sympy,wyom/sympy,hrashk/sympy,mcdaniel67/sympy,sahilshekhawat/sympy,emon10005/sympy,iamutkarshtiwari/sympy,mafiya69/sympy,kaichogami/sympy,atreyv/sympy,jbbskinny/sympy,emon10005/sympy,maniteja123/sympy,pbrady/sympy,souravsingh/sympy,liangjiaxing/sympy,ga7g08/sympy,kaushik94/sympy,oliverlee/sympy,ChristinaZografou/sympy,yashsharan/sympy,grevutiu-gabriel/sympy,sahilshekhawat/sympy,aktech/sympy,kaushik94/sympy,moble/sympy,kaushik94/sympy,asm666/sympy,MechCoder/sympy,AunShiLord/sympy,shipci/sympy,meghana1995/sympy,kumarkrishna/sympy,hargup/sympy,ahhda/sympy,VaibhavAgarwalVA/sympy,mcdaniel67/sympy,dqnykamp/sympy,jerli/sympy,MridulS/sympy,Shaswat27/sympy,lidavidm/sympy,Vishluck/sympy,Davidjohnwilson/sympy,drufat/sympy,Davidjohnwilson/sympy,rahuldan/sympy,Designist/sympy,sunny94/temp,yukoba/sympy,grevutiu-gabriel/sympy