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'Vital?' printed from https://nrich.maths.org/

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This is the third of our challenge ciphers.

We recommend that you attempt them in order, as the solution of each challenge gives a small (and necessary!) hint for the next challenge.

 

  O Q B I K P N J A G Y L W R U S D H X E M T F V C Z
f 72 48 31 29 28 27 25 24 23 21 16 14 13 12 11 10 9 8 7 4 3 3 2 2 1 1
% 16 11 7 7 6 6 6 5 5 5 4 3 3 3 2 2 2 2 2 1 1 1 0 0 0 0

 

 

 

OYBLAON 5   ORNOMSOIYX 2
GOQQONP 4   GOQQONPUBQA 2
HOPPKDO 3      
IOYBLAO 3      
OIYNXLQ 3      

 

Top Digraphs   Top Tri-graphs            
ON 15   QAO 8   BLAO 5   OQQONP 5
QA 15   AON 6   LAON 5   OYBLAO 5
AO 14   BLA 5   OQQO 5   YBLAON 5
OI 10   GOQ 5   OYBL 5   GOQQON 4
BI 9   LAO 5   QONP 5   HOPPKD 3
GO 9   OIY 5   QQON 5   IOYBLA 3
OQ 8   ONP 5   YBLA 5   IYNXLQ 3
QO 8   OQQ 5         OIYNXL 3
NO 7   OYB 5         OPPKDO 3
OY 7   QON 5            
IQ 6   YBL 5            
LA 6   BQA 4            
PB 6   ONO 4            
QJ 6   UBQ 4            
QQ 6   AOG 3            
BL 5   BIQ 3            
BQ 5   HOP 3            
IO 5   IOY 3            
IY 5   IYN 3            
NP 5   KBI 3            
PQ 5   KDO 3            
SP 5   NXL 3            
      OPP 3            
      PBI 3            
      PKD 3            
      PPK 3            
      XLQ 3            
      YNX 3