1.   Any visitor who tries to imagine the brutal ferocity of what happened here a half-century ago undertakes an impossible challenge.

2.   Both leaders face almost impossible domestic challenges.

3.   But to a blind person, each can be a seemingly impossible challenge.

4.   For defense lawyers, a client who wants to disrupt the very system they are sworn to uphold poses an impossible challenge.

5.   It was generally considered an impossible challenge, but it happened.

6.   Trying to resolve amicably the competing political interests of three powerhouses in a league this rough would seem to represent an impossible challenge.

7.   When police are charged with behavior this awful, the authorities have a nearly impossible challenge.

8.   But Cuba played a defensive game, and Haiti could not meet the almost impossible challenge.

9.   Team manager Zen Shirai said the team had undergone hard, physical training and the huge Welsh forwards would not represent an impossible challenge.