A a
t1
t2
1B b2
1C c2
1D d2
1B b2
1C c2
1D d2
  span
  t3
  t4
  1span2
  1span2
  1span2
  1span2
  1span2
  1span2
  1span2
  1span2
  1span2
 
  span
  1span2
  1span2
  1span2
 
  span
  1span2
  1span2
  1span2
 
  span
  1span2
  1span2
  1span2
 
  span
  1span2
  1span2
  1span2
 
  span
  1span2
  1span2
  1span2
 
  span
  1span2
  1span2
  1span2
 
  span
  1span2
  1span2
  1span2
 
  span
  1span2
  1span2
  1span2
 
  span
  1span2
  1span2
  1span2