public void run() {
                        for (int i = firstIdx; i < lastIdx; i++) {
                            int idx1 = 2 * i;
                            int idx2 = idx1 + 1;
                            int idx3 = offa + i;
                            ak[idx1] = a[idx3] * bk1[idx1];
                            ak[idx2] = a[idx3] * bk1[idx2];
                        }
                    }