premise: a group of musicians playing music in the street. hypothesis: The chamber orchestra plays in front of the church.
contradiction: An orchestra could be considered a group of musicians as they are musicians that play instruments. Sentence one says the group is playing in the street and sentence two says the group is playing in front of the church. The musicians could be playing music in the street in front of the church. So we do not know if these are two different groups or the same group.