Fix case bug not showing expressions with one variable
Fix case bug not showing expressions with one variable

nomeata/codeworld,alphalambda/codeworld,google/codeworld,parvmor/codeworld,stefan-j/codeworld,three/codeworld,alphalambda/codeworld,google/codeworld,nomeata/codeworld,venkat24/codeworld,alphalambda/codeworld,parvmor/codeworld,stefan-j/codeworld,parvmor/codeworld,tgdavies/codeworld,nomeata/codeworld,stefan-j/codeworld,three/codeworld,google/codeworld,pranjaltale16/codeworld,venkat24/codeworld,pranjaltale16/codeworld,three/codeworld,pranjaltale16/codeworld,venkat24/codeworld,tgdavies/codeworld,tgdavies/codeworld