   [0] Number of roots=0, leaves=0, remote ranks=0   [0] 0 <- (0,0)   [0] 0 <- (0,0)   [0] Number of roots=0, leaves=0, remote ranks=0   [0] 0 <- (0,0)   [0] 0 <- (0,0)   [0] 0 <- (0,0)   [0] Number of roots=0, leaves=0, remote ranks=0   [0] 0 <- (0,0)   [0] 0 <- (0,0)   [0] 0 <- (0,0)   [0] Roots referenced by my leaves, by rank   [0] 0: 0 edges   [0]    0 <- 0   [0] 0: 0 edges   [0]    0 <- 0   [0] Roots referenced by my leaves, by rank   [0] 0: 0 edges   [0]    0 <- 0   [0]    0 <- 0   [0] 0: 0 edges   [0]    0 <- 0   [0] Roots referenced by my leaves, by rank   [0] 0: 0 edges   [0]    0 <- 0   [0]    0 <- 0   [0] 0: 0 edges   [0]    0 <- 0 