Structural properties, Takzei

• S1631723
• S1631724
• S1923574
• S1923583
• S1923571
• S1923572
• S1923573
• S1923581
• S1923576
• S1923577
• S1923578
• S1923575
• S1923579
• S1923580
• S1923582
• S1923584