Evaluate the similarity between them and classify them into classes from 0-5 as follows:
0 : The two sentences are completely dissimilar.
1 : The two sentences are not equivalent, but are on the same topic.
2 : The two sentences are not equivalent, but share some details.
3 : The two sentences are roughly equivalent, but some important information differs/missing.
4 : The two sentences are mostly equivalent, but some unimportant details differ.
5 : The two sentences are completely equivalent, as they mean the same thing.

Example Input: Sentence 1: Among three major candidates, Schwarzenegger is wining the battle for independents and crossover voters. Sentence 2: Schwarzenegger picks up more independents and crossover voters than Bustamante.
Example Output: 3

Example Input: Sentence 1: Man standing in front of yellow corvette. Sentence 2: A man is standing next to a yellow sports car.
Example Output: 3

Example Input: Sentence 1: The man is pushing the van. Sentence 2: The woman is singing.
Example Output:
0