#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
struct dint{
int a;
int b;
};
int N, Q, H, hh;
vector<dint> A;
vector<int> R;
vector<int> B;
vector<vector<int>> S;
vector<int> HL;
vector<int> O;
vector<vector<int>> D;
bool comp1(int i, int j) {
// if (A[i].b == A[j].b) {
// return A[i].a < A[j].b;
// } else {
return A[i].b < A[j].b;
// }
}
bool jde(int i, int j) {
return ((A[B[j]].a <= A[B[i]].b) && (A[B[i]].b <= A[B[j]].b));
}
int main() {
cin >> N >> Q;
A.resize(N);
B.resize(N);
R.resize(N);
D.resize(N);
for (int i = 0; i < N; i++) {
cin >> A[i].a >> A[i].b;
B[i] = i;
R[i] = -1;
D[i].resize(0);
}
sort(B.begin(), B.end());
for (int j = 0; j < N; j++) {
int i = j - 1;
while (jde(i, j)) {
if (R[i] == -1) {
R[i] = j;
}
i--;
if (i < 0) {
goto abcd;
}
}
abcd:;
}
hh = 1;
H = 3;
while (hh < N) {
H++;
hh *= 2;
}
S.resize(H);
for (int h = 0; h < H; h++) {
S[h].resize(N);
for (int i = 0; i < N; i++) {
S[h][i] = ((h == 0) ? R[i] : ((S[h - 1][i] == -1) ? -1 : S[h - 1][S[h - 1][i]]));
}
}
O.resize(0);
for (int i = 0; i < N; i++) {
if (R[i] == -1) {
O.push_back(i);
} else {
D[R[i]].push_back(i);
}
}
HL.resize(N);
while (O.size() > 0) {
int o = O.back(); O.pop_back();
HL[o] = ((R[o] == -1) ? 0 : HL[R[o]] + 1);
for (int d: D[o]) {
O.push_back(d);
}
}
for (int q = 0; q < Q; q++) {
int u, v;
cin >> u >> v; u--; v--;
// if (HL[u] < HL[v]) {
// u ^= v;
// v ^= u;
// u ^= v;
// }
if (HL[u] < HL[v]) {
if (jde(u, v)) {
cout << "1\n";
} else {
cout << "impossible\n";
}
} else {
int result = HL[u] - HL[v];
hh = 1;
int h = 0;
while (HL[u] != HL[v]) {
if ((HL[u] - HL[v]) % (2 * hh) != 0) {
u = S[h][u];
}
H++;
hh *= 2;
}
if (u == v) {
cout << result << endl;
} else {
cout << "impossible\n";
}
}
}
return 0;
}
