Cartan #0:
split: 1; compact: 7; complex: 0
canonical twisted involution: e
twisted involution orbit size: 8; fiber size: 128; strong inv: 1024
imaginary root system: D7
real root system is empty
complex factor: A1
real form #3: [0,1,2,4,5,6,8,10,11,13,16,17,18,20,21,22,24,26,27,29,32,34,35,37,
    40,41,42,44,45,46,49,52,54,55,59] (35)
real form #2: [3,7,9,12,14,19,23,25,28,30,33,36,38,43,47,48,50,53,56,58,
    61] (21)
real form #1: [15,31,39,51,57,60,62] (7)
real form #0: [63] (1)