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.

Ex Input:
Sentence1: if a habitat can no longer support animals then those animals will move to another area. 
Sentence2: Each species of animal is unique.

Ex Output:
animals


Ex Input:
Sentence1: Mitosis is cell division. 
Sentence2: Chromosomes are the form of the genetic material of a cell during mitosis.

Ex Output:
Mitosis


Ex Input:
Sentence1: Examples are the E-Coli bacteria and Hanta virus. 
Sentence2: E-coli is part of the most diverse and abundant group of organisms on Earth.

Ex Output:

E-Coli