#stanja#
s0;
s1;

#azbuka#
a;b;c;d;

#pravila#
s1:(a,b,R,s1);
s1:(b,c,R,s1);
s1:(c,a,R,s1);
s1:(*,d,N,s0);

#traka# 
aabcb;

#pocetno# s1;
#zavrsna# s0;