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hi! I share you my two 4-color series with 16 and 20 twists. I hope they will be used to find a new shortest solution.
{R15L (face,piece,direction)
T11L
R15R
T11R
B6
T11L
R15L
T11R
R15R
B6} x2 =20 moves
and
R15R
T11R
R15L
T11L
F11R
U15L
F11L
U15R
T11R
R15R
T11L
R15L
U15L
F11R
U15R
F11L =16 moves
bye
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