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You are playing a solitaire game in which there are N stacks of face-up cards, each of which initially has C cards. Each card has a value and a suit, and no two cards in the game have the same value/suit combination.
In one move, you can do one of the following things:
You win the game if you can make a sequence of moves such that eventually, each stack contains at most one card. Given a starting arrangement, determine whether it is possible to win the game.
The first line of the input gives the number P of premade stacks that will be used in the test cases. Then, P lines follow. The i-th of those lines begins with an integer Ci, the number of cards in the i-th of those premade stacks, and continues with Ci ordered pairs of integers. The j-th of these ordered pairs has two integers Vij and Sij, representing the value and suit of the j-th card from the top in the i-th premade stack.
Then, there is another line with one integer T, the number of test cases. T test cases follow. Each case begins with one line with two integers N and C: the number of stacks, and the number of cards in each of those stacks. Then, there is one line with N integersPi, representing the indexes (starting from 0) of the test case's set of premade stacks.
For each test case, output one line containing
Case #x: y, where
x is the test case number (starting from 1) and
POSSIBLE if it is possible to win the game, or
5 2 7 2 7 1 2 6 4 7 4 2 3 2 6 2 2 4 2 10 2 2 5 4 7 3 2 2 2 0 2 3 2 4 1 3
Case #1: POSSIBLE Case #2: IMPOSSIBLE
In sample case #1, there are two stacks, each of which has two cards. The first stack has a 7 of suit 2 on top and a 7 of suit 1 below that. The second stack has a 3 of suit 2 on top and a 6 of suit 2 below that.
It is possible to win the game as follows:
In sample case #2, there are three stacks, each of which has two cards. It is not possible to win the game in this case; the only possible move is to remove the 5 of suit 4 on top of the third stack, and this does not open up any new moves.