General Report on Tunny
25G Page 179
(l) Letter counts against doubtful characters.
To make ΔΧ certain a new ordinary 32-letter count 
is made on the rectangle message MB2005, and also a 32-letter count against the doubtful 7th character, supposing it to be a cross. The letter count against the 7th character is decibanned from the complete letter count, for example for /'s the decibannage is 
.
In effect 7 runs are used; this makes ΔΧ1 certain. (cf 25D(g)3)
(m) Making ΔΧ2 certain.
The letter count 
on MB2004 suggests a slightly odd run 
for ΔΧ3, and also run 
for ΔΧ3. The previous letter count is used to deciban runs 
, 
, 
for ΔΧ2; ΔΧ3 becomes certain.
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