Given a column of random letters, I want to identify sequences of a minimum of 3 consecutive letters from the alphabet. For example, if the following letters are given in a column: a,b,c,x, l,m,n, p,g,m,n,o,p,p,g (series1) or a,b,c, k, l,m,n,p,g,m,n,o,p,p,g (series2), I want to get TRUE for the...