combo(LL, LR, UR, UL)
x = data.table(
LL = c('W,R', 'Y,DB', NA, 'NOBA', NA),
LR = c('Y', 'DB', 'c', NA, NA),
UR = c('Y', 'W', 'G', 'R', NA)
x[,combo(LL, LR), by = .I ]
x[,combo(LL, LR, UR), by = .I ]
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