x   3
y   4
z   5
ta  map
ta1 int
ta7 absent
tb  map
tb1 map
tb7 absent
tc  map
tc1 int
tc7 absent
td  map
td1 map
td7 absent
te1 int
te2 map
tsa absent
tsx int
ts  map

x   6
y   7
u   8
ta  map
ta1 int
ta7 absent
tb  map
tb1 map
tb7 absent
tc  map
tc1 int
tc7 absent
td  map
td1 map
td7 absent
te1 int
te2 map
tsa absent
tsx int
ts  map
