../ Comment_on_Problems_28_and_29.pdf 04-Dec-2015 16:26 50130 Corrections_20_07.pdf 04-Dec-2015 16:26 170413 Preparatory_problems_IChO_2015_July_8.pdf 04-Dec-2015 16:26 1766696 Problems_28_and_29_updated_May_1.pdf 04-Dec-2015 16:26 221065 Scope_of_the_Excel_knowledge.pdf 04-Dec-2015 16:27 185948 Solutions_Preparatory_problems_IChO_2015_July_2..> 04-Dec-2015 16:27 1565686