The Shortest Common Superstring problem (SCS) consists, for a set of strings
S = {s_1,...,s_n}, in finding a minimum length string that contains all s_i,
1<= i <= n, as substrings. While a 2+11/30 approximation ratio algorithm has
recently been published, the general objective is now to break the conceptual
lower bound barrier of 2. This paper is a step ahead in this direction. Here we
focus on a particular instance of the SCS problem, meaning the r-SCS problem,
which requires all input strings to be of the same length, r. Golonev et al.
proved an approximation ratio which is better than the general one for r<= 6.
Here we extend their approach and improve their approximation ratio, which is
now better than the general one for r<= 7, and less than or equal to 2 up to r
= 6
