01:21:15 (00615)
Кватернион:01:21:15 (00018438):18
21:15:18 (18438)
2 1 ∇ 5 1 {\displaystyle {}_{2}^{1}\!\nabla _{5}^{1}}
0 1 Δ 1 2 {\displaystyle {}_{0}^{1}\!\Delta _{1}^{2}} + 1 5 Δ 8 1 {\displaystyle {}_{1}^{5}\!\Delta _{8}^{1}}