Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.

Input: Consider Input: Sentence1: decomposition increases the amount of nutrients in the soil. 
Sentence2: decomposition increases the amount of cations.

Output: amount


Input: Consider Input: Sentence1: a flashlight converts chemical energy into light energy. 
Sentence2: Chemical energy converted to light energy requires batteries.

Output: chemical


Input: Consider Input: Sentence1: Hurricanes have five categories depending on wind speeds. 
Sentence2: An anemometer can be used to determine hurricane category.


Output: Hurricanes