\[y = \lbrack x\rbrack - 2;\ \ \ \ y = \lbrack x - b\rbrack + c\]
\[b = 1;\ \ c = - 1:\]
\[y = \lbrack x - 1\rbrack + ( - 1) =\]
\[= \lbrack x - 1\rbrack - 1.\]