logistic Out Exp var_n var_m var_k var_k

var_n != 1 predicts success perfectly
var_n dropped and 1 obs not used

var_m != 1 predicts failure perfectly
var_mdropped and 18 obs not used

On running logistic regression with above two covariates, stat output for these covariates were omitted. There is no cell with 0 count on doing tab Out var_n and Out var_m.

What does it reflect? Any way to rectify it.