How long did talk last before a treaty was signed between Romanian and Bolshevik governments?
return talks between Romanian and  Bolshevik governments ;return a treaty was  signed between Romanian and  Bolshevik governments ;return when  was  #1 ;return when  was  #2 ;return the  lowest of #3 ;return the  difference of #4 and  #5
['select', 'select', 'project', 'project', 'aggregate', 'arithmetic']