Resistance between two points in complex circuit

1. The problem statement, all variables and given/known data
I have attached a circuit scheme from old textbook. Basically, there are 17 resistors which every has resistance R and we need to find the resistance between points A and B. (I added numbers to each resistor so it would be easier to communicate).
Extra question of mine – is the equivalent resistance equal to that between points A and B?

2. Relevant equations
R = R1 + R2 + R3 + …
1 / R = 1 / R1 + 1 / R2 + 1 / R3 +…

3. The attempt at a solution
I have solved some resistors circuits exercises, but this one is more complex. I simply added 1st resistor with 3rd and 2nd with 5th, because they are in series. Now I am stuck, because I am not sure which resistors are in parallel and which are not, because they are combining to each other. I would be grateful if someone would explain from where should I start or show an example of how to solve such type of circuits.

Attached Images
File Type: jpg 20140113_142015(0).jpg (143.8 KB)

http://ift.tt/1eBzF5Y

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