59. Read the solution to the puzzle. speak or spoke?

Oleg spoke to Hans Schulz (Clue 1). Therefore, we know for sure that he could not

speak to Mark, Susan, Mike, Mary or Kate. Denis spoke to Susan (Clue 2). Therefore, we know for sure that he could not speak to Mark, Mike, Mary or Kate. Ivan spoke to Mark (Clue 3). Therefore, we know for sure he could not speak to Mike, Mary or Kate. Larisa spoke to Mike (Clue 4). Kate didn't to Olga (Clue 5). By elimination, Nina spoke to Kate and Olga spoke to Mary.