“…Considering rows as blocks, ignoring column and cell classifications, the design is a PBIB design following a circular association scheme (Das, 1960;Kulshreshtha et al, 1971;Saha et al, 1974) with m 2 + 1 (for m even) associate classes and parameters v, b = m, r = p, k = ps, n 1 = s − 1, n 2 = · · · = n m 2 = 2s, n m 2 +1 = s, λ i = p − (i − 1), i = 1, 2, . .…”