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**1 - 2**of**2**### Table 3 So the PBIBD, X, satis es XJ = JX = 9, XXT = 9I3 I7 I3 + (J ? I)3 J7 J3 + (J ? I)3 I7 2J: Hence we have a PBIBD(63; 63; 9; 9; 1 = 0; 2 = 1; 3 = 3). Acknowledgment: We wish to thank Dr. Kishore Sinha for his helpful advice and com- ments.

"... In PAGE 10: ... The set of rows corresponding to the product of the xth rows and the yth rows, x 2 Si, y 2 Sj, i 6 = j give the second association class with 2 = . 2 Table3 gives some of the generalized weighing matrices and PBIBDs parameters obtained by using Theorem 12 and Lemma 13. Example 11 From the GW(21; 9; Z3) with !i replaced by Ti we have the classes comprising rows 3j + 1, 3j + 2, 3j + 3, j = 0; 1; : : :; 20 with inner product zero.... ..."

### Table 3 So the PBIBD, X, satis es XJ = JX = 9, XXT = 9I3 I7 I3 + (J ? I)3 J7 J3 + (J ? I)3 I7 2J: Hence we have a PBIBD(63; 63; 9; 9; 1 = 0; 2 = 1; 3 = 3). Acknowledgment: We wish to thank Dr. Kishore Sinha for his helpful advice and com- ments.

1998

"... In PAGE 10: ... The set of rows corresponding to the product of the xth rows and the yth rows, x 2 Si, y 2 Sj, i 6 = j give the second association class with 2 = . 2 Table3 gives some of the generalized weighing matrices and PBIBDs parameters obtained by using Theorem 12 and Lemma 13. Example 11 From the GW(21; 9; Z3) with !i replaced by Ti we have the classes comprising rows 3j + 1, 3j + 2, 3j + 3, j = 0; 1; : : :; 20 with inner product zero.... ..."

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