  In this paper it is shown that Family of Linear Relations of Contraction
($FRLC$) are the only ones, up to linear combination, that vanish the
Lagrangian-Grassmannian. It is shown that the Pl\"ucker matrix of the
Lagrangian-Grassmannian is a direct sum of incidence matrix, regular and sparce
with entries in the set { 0, 1}.
