numbers in sequence order
{1, 3, 5, 7} is the sequence of the first 4 odd numbers (and is a finite sequence) {4, 3, 2, 1} is 4 to 1 backwards. {1, 2, 4, 8, 16, 32, ...} is an infinite sequence where every term doubles. {a, b, c, d, e} is the sequence of the first 5 letters alphabetically. {f, r, e, d} is the sequence of letters in the name fred. {0, 1, 0, 1, 0, 1, ...} is the sequence of alternating 0s and 1s (yes they are in order, it is an alternating order in this case)