Crocodile chooses 1 x 4 tile from 2018 x 2018 square.The bear has tilometer that checks 3x3 square of 2018 x 2018 is there any of choosen cells by crocodile.Tilometer says "YES" if there is at least one choosen cell among checked 3 x 3 square.For what is the smallest number of such questions the Bear can certainly get an affirmative answer? combinatoricscombinatorics unsolvedTiling