<image>The three triangles shown in the figure are constructed using 6, 7, and 8 matchsticks of equal length, respectively, joined end to end in sequence.

(1) Can 4 matchsticks joined end to end in sequence form a triangle? (Fill in "Yes" or "No");
(2) How many different triangles can be constructed with 9 or 11 matchsticks joined end to end in sequence? Please write down their side lengths respectively.