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Designer Door Mat Mr. Vincent works in a door mat manufacturing company. One day, he designed a new door mat with the following specifications: Mat size must be N X M. (N is an odd natural number, and M is 3 times N.) The design should have 'WELCOME' written in the center. The design pattern should only use |, . and - characters. Sample Designs Size: 7 x 21 ---------.|.--------- ------.|..|..|.-..