This function generates a block design with specified parameters and concurrence matrix through an alternative linear integer programming approach
NLIP(v,b,k,NNPo)number of test treatments
number of blocks
block size
specified concurrence matrix
Returns a design or a text saying that no design found
MANDAL, B., GUPTA, V., & PARSAD, R. (2012). Generation of Binary Incomplete Block Design with a Specified Concurrence Matrix. Journal of Statistics & Applications, 7.