All subnodes of 'I':
a : 0
b : 1
All subnodes of 'J':
b : 1
c : 0
All subnodes of 'a':
a : 0
All subnodes of 'b':
b : 1
All subnodes of 'c':
c : 0
All subnodes of 'I.a':
a : 0
All subnodes of 'I.b':
b : 1
All subnodes of 'J.a':
b : 1
All subnodes of 'J.b':
c : 0
All subnodes of 'I':
a : 1
b : 0
All subnodes of 'J':
b : 0
c : 1
All subnodes of 'a':
a : 1
All subnodes of 'b':
b : 0
All subnodes of 'c':
c : 1
All subnodes of 'I.a':
a : 1
All subnodes of 'I.b':
b : 0
All subnodes of 'J.a':
b : 0
All subnodes of 'J.b':
c : 1
