current:
====ceiling====
1T2
====floor=====
after 5' up:
====ceiling====
T
1 2
====floor=====
==========
1T2
3 4
==========
====ceiling====
T
1 2
====floor====
==========
1T2
3 4
==========
====ceiling====
T
1 2
====floor====
==========
1T2
3 4
==========
====ceiling====
T
1 2
====floor====