; (B) an action, suit, or proceeding that is related to another action, suit, or proceeding pending before a judge of the district court; (C) an application for a writ of habeas corpus under section 2242 or any related proceeding; or (D) a motion to vacate, set aside, or correct a sentence under section 2252 or any related proceeding. (3) Low-population districts (A) Definition In this paragraph, the term low-population district means a district that does not have enough judges to ensure that the probability that an action, suit, or proceeding is assigned to any particular judge does not exceed 25 percent, as required under paragraph (1). (B) Use of judges from adjacent districts The chief judge of the circuit in which a low-population district is located may assign 1 or more judges from 1 or more districts that are adjacent to, and in the same State as, the low-population district to serve in the low-population district as necessary to ensure that the probability that an action, suit, or proceeding is assigned to any particular judge does not exceed 25 percent, as required under paragraph (1). (C) Exception Notwithstanding paragraph (1), if there are no adjacent districts within the same State as a low-population district, the probability that an action, suit, or proceeding is assigned to any particular judge in the low-population district may not be greater than the percentage obtained by dividing the number 1 by the number of judges within the low-population district. . (b) Three-Judge courts Section 2284(b)(1) of title 28, United States Code, is amended— (1) in the first sentence, by striking designate two and inserting randomly designate three