This data set is used to illustrate multi-state survival curves.
  It is based on the actual study in the reference below.
  A subset of subjects was de-identifed, reordered, and then all of the
  time values randomly perturbed.
Mutations in the FLT3 domain occur in about 1/3 of AML patients,
  the additional agent in treatment arm B was presumed to target this anomaly.
  All subjects had a FLT mutation, either internal tandem duplications (ITD)
  (divided into low vs high) +- mutations in the TKD domain, or TKD mutations
  only.  This was a stratification factor for treatment assignment in
  the study.   The levels of A, B, C correspond to increasing severity of the
  mutation burden.