ar: Arabic · bg: Bulgarian · cs: Czech · da:Danish · de: German · el: Greek · en: English · es: Spanish · et : Estonian · fa: Persian · fi: Suomi · fr: French · he: Hebrew · hi: Hindi · hr: Croatian · hu: Hungarian · id: Indonesian · is: Icelandic · it: Italian · ja: Japanese · ko: Korean · lt: Lithuanian · lv: Latvian · nl: Dutch · no: Norwegian · pl: Polish · pt: Portuguese · ro: Romanian · ru: Russian · sk: Slovak · sl: Slovenian · sr: Serbian · sv: Swedish · th: Thai · tr: Turkish · vi: Vietnamese · zh: Chinese

... RMPROBL ... (6 elements)

... MPROBL ... (12 elements)

ATEMPROBLEME · DARMPROBLEMEN · PHANTOMPROBLEM · REFORMPROBLEM · REFORMPROBLEME · STEINERBAUMPROBLEM · SYSTEMPROBLEMEN

... RMPROB ... (7 elements)

DARMPROBLEMEN · IODOFORMPROBE · REFORMPROBLEM · REFORMPROBLEME

... ORMPROBL ... (4 elements)

REFORMPROBLEM · REFORMPROBLEME

... RMPROBLE ... (6 elements)

DARMPROBLEMEN · REFORMPROBLEM · REFORMPROBLEME