diff --git a/solver.cpp b/solver.cpp
index 5dfbb35..281c766 100644
--- a/solver.cpp
+++ b/solver.cpp
@@ -21,9 +21,13 @@ Solver::Solver(int _N, int _M) : N(_N), M(_M) {
 vector<int> Solver::guess() {
 	return {};
 }
-// TODO
 void Solver::learn(vector<int> guess, Response response) {
-	
+	vector<vector<int>> next_possible(0);
+	for(int i = 0; i < possible.size(); i++)
+		if(validate(possible[i], guess) == response)
+			next_possible.push_back(possible[i]);
+
+	possible = next_possible;
 }
 
 // TODO