RM<=6.941: 19.9 [19.333-20.534]
RM>6.941
|    RM<=7.437
|    |    CRIM>7.393: 14.4 [10.172-18.628]
|    |    CRIM<=7.393
|    |    |    DIS<=1.886: 45.7 [37.124-54.176]
|    |    |    DIS>1.886: 32.7 [31.656-33.841]
|    RM>7.437
|    |    TAX<=534.500: 45.9 [44.295-47.498]
|    |    TAX>534.500: 21.9 [21.900-21.900]

