:typeat 6 1 f
:typeat 7 1 f
:typeat 7 3 x
:typeat 7 5 y
:typeat 9 5 x'
:typeat 9 11 x
:typeat 12 8 x''
:typeat 12 16 x
:typeat 15 9 y'
:typeat 15 14 y
:typeat 18 12 y''
:typeat 18 19 y
:typeat 21 9 a
:typeat 22 9 a
:typeat 22 13 x'
:typeat 25 13 x
:typeat 25 15 x'
:typeat 25 18 x''
:typeat 25 22 y
:typeat 25 24 y'
:typeat 25 24 y'
:typeat 25 27 y''
:typeat 25 31 a
:q