"But they said after that we can consider CG as Pattern because E has already been used in another pattern "
you can't use CG if E was used in another pattern, you can only use it if E was used in that same pattern like in their example.
you can do this pattern: D-E-G-C
but not: C-G

n the example countPatternsFrom("C", 2):
they said that it has 5 solutions.But they said after that we can consider CG as Pattern because E has already been used in another pattern .
but in th example countPatternsFrom("C", 2) we used C->E as pattern it means that we can consider CG as patter because E has been used in CE.. it means that it ahs 6 solutions and not only 5 ..
can someone explain why they said 5 pattenr and didnt consider the pattern C->G?
thanx in advance

...because those are only starting points, so E hasn't been used yet, maybe?

we used it in the picture but didnt used it in the example countPatternsFrom("C", 2)
look: they said (C -> B), (C -> D), (C -> E), (C -> F) and (C -> H) but didnt mention C->G
that what i mean

what? we used C->G. Just look at the picture in the description.

edit: well, it's G->C here, but that's just the same logic.

thats the issue. we have used E before and nevertheless we didnt use C->G ??

you cannot do a direct C->G if E is free. But if you used it (E) before, then you can.

in the example countPatternsFrom("C", 2):
they said that it has 5 solutions.But they said after that we can consider CG as Pattern because E has already been used in another pattern .
but in th example countPatternsFrom("C", 2) we used C->E as pattern it means that we can consider CG as patter because E has been used in CE.. it means that it ahs 6 solutions and not only 5 ..
can someone explain why they said 5 pattenr and didnt consider the pattern C->G?
thanx in advance