Algorithm
(NB2 NR2)2
U' (NB2 NR2)2 U (10 btm, 18 ftm, 34 qtm)
Algorithm Walter Randelshofer 2011
NR' F' NR NB2 NR' F NR NB2 (8 btm, 14 ftm, 18 qtm)
Algorithm Per Kristen Fredlund 2014
NL2 D' NR2 D NL2 D' NR2 D (8 btm, 12 ftm, 20 qtm)