On Characterizing Nilpotent Lie Algebra by Their Multiplier, $$ s(L)=6, 7 $$

Let L be an n-dimensional non-abelian nilpotent Lie algebra and $$ s(L)=\frac{1}{2}(n-1)(n-2)+1-\dim {\mathcal {M}}(L) where is the Schur multiplier of a L. The structures algebras when s(L)\in \lbrace 0,1,2,3,4,5\rbrace are determined. In this paper, we classify all s(L)=6,7.