array (size=8)
  'F' => int 5
  'N' => int 4
  'I' => int 4
  'P' => int 4
  'S' => int 3
  'J' => int 3
  'E' => int 3
  'T' => int 2


if(I > E) {
first key = I;
and second key = E;
} else {
first key = E;
and second key = I;
}

if(N > S) {
third key = N;
and fourth key = S;
} else {
third key = S;
and fourth key = N;
}

if(T > F) {
fifth key = T;
and sixth key = F;
} else {
fifth key = F;
and sixth key = T;
}

if(P > J) {
seventh key = P;
and eight key = J;
} else {
seventh key = J;
and eight key = P;
}