North Korea has once again been broadcasting random numbers believed to be coded instructions to undercover spies.

At 1:15 AM South Korean time Friday, the overseas-directed Pyongyang Broadcasting Station announced it would broadcast the answer key to an electronic engineering quiz, allegedly for students enrolled in a distance learning course.

The anchor then recited a series of numbers, to the effect of "number four on page 26, number 48 on page 305" and so forth.

The numbers recited were identical to an earlier broadcast the station aired on November eleventh.

 The practice had fallen dormant in recent years --- but this year, North Korea has transmitted 15 number broadcasts since June.