描述
首分析各输出Y0、Y1、Y2与各输入X0、X1、X2、X3之间的逻辑关系。由t2~t3；t9~t10分析可见X0和X1“逻辑与”后控制Y0，如右图所示。
由t1~t5；t8~t11；t13~t14分析可见X0、X1“逻辑或”后控制Y1，如右图所示。
由t2~t3；t6~t7；t9~t10；t12~t15分析可见t2~t3；t9~t10是X0，X1相“与”控制Y2，t6~t7；t12~t15是X2控制Y2，所以X0，X1相“与”再和X2相“或”后控制Y2，如右图所示
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