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: Germination depends on the seed coat. 
Sentence2: the force of water causes germination with the emergence of a root.

Output: Germination


Input: Consider Input: Sentence1: Ground tissue makes up most of the interior of a plant. 
Sentence2: ground tissue makes up most of the interior of a dandelion.

Output: Ground


Input: Consider Input: Sentence1: Bivalves feed on plankton and nonliving organic matter. 
Sentence2: Clams and oysters feed on plankton and nonliving organic matter.


Output: feed