Passage Summary: Every brick house has a yard, and most houses with yards have two stories, so the author concludes most brick houses must have two stories.

Conclusion: Most of the brick houses on River Street are two-story buildings.

Reasoning: All brick houses on the street have front yards, and most houses on that street with front yards are two stories tall.

Analysis: This argument suffers from a classic quantifier overlap flaw. Even though all brick houses (Group A) are inside the 'yard' category (Group B), and most 'yard' houses (Group B) are two-story (Group C), the brick houses could easily be the small minority of 'yard' houses that are only one story. To find a parallel flaw, look for an analogy where a sub-group is part of a larger group, and a majority trait of that larger group is incorrectly attributed to the sub-group.