Remove unused Question::LEVELS
Remove unused Question::LEVELS
zoul/open-data-certificate,Motejl/open-data-certificate,ahmadassaf/open-data-certificate,Motejl/open-data-certificate,ahmadassaf/open-data-certificate,zoul/open-data-certificate,zoul/open-data-certificate,zoul/open-data-certificate,ahmadassaf/open-data-certificate,theodi/open-data-certificate,Motejl/open-data-certificate,theodi/open-data-certificate,theodi/open-data-certificate,Motejl/open-data-certificate,theodi/open-data-certificate,ahmadassaf/open-data-certificate