Problem

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Problem

Dalam abjad bahasa puak «Tumba-Yumba» empat huruf: "K", "L", "M" dan "N". Kami perlu memaparkan semua kemungkinan perkataan yang terdiri daripada n huruf (n > 1) di mana huruf kedua ialah «K». Kira bilangan perkataan tersebut. 
 
Contoh

(c)  K.Yu. Polyakov

time 1000 ms
memory 256 Mb
Rules for program design and list of errors in automatic problem checking

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# Input Output
1 2 KK
LK
MK
NK
4