One problem with this system is that other cores on the same lines (X or Y) will give off a very small signal as well, potentially masking the signal being looked for. The conventional solution was to wire the read line diagonally back and forth through the plane, so that these smaller signals would cancel out—the positive signal from one would be a negative signal from the next as the wire passed through it in the opposite direction. However this solution also made wiring the core fairly difficult, and considerable amounts of research went into various ways to improve the cost of wiring core.