Saikawa and Nishinosono return to the camp, putting off trying to find a solution to the case. But they can't stop thinking about it. They go back to the lab and investigate Dr. Shiki's rooms again, where they find a strange number that is a clue.
The other two are "R" and "1." 
Both are one character.
"1" و "R" الاثنان الآخران هما
.كلاهما بحرف واحد
Die anderen beiden sind R und 1,
also jeweils nur ein Zeichen.
Los otros pisos son R y 1. 
Ambos tienen un solo carácter.
Los otros pisos son R y 1. 
Ambos tienen un solo carácter.
Hormis le B2, les niveaux R et 1
n’ont qu’un seul signe.
Gli altri sono "R" e "1", che hanno un carattere!
Além do "B2", só existem o 
"R" e o "1", que são apenas um dígito.