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from Wikipedia: = (K+L)(K+M)(L+N)(M+P)(N+Q)(P+Q) = (K+LM)(N+LQ)(P+MQ) = (KN+KLQ+LMN+LMQ)(P+MQ) = KNP + KLPQ + LMNP + LMPQ + KMNQ + KLMQ + LMNQ + LMQ ----------------------------------------------------------------------------------------- K * N+LQ + LM*(N+LQ) K * N+LQ = KN+KLQ and LM*(N+LQ) = LMN+LMQ for the : (KN+KLQ+LMN+LMQ) for the fourth line multiply the third line by P and then by MQ from (P+MQ)