Page 31, Column 1, Paragraph(s) 16, Core Rule Book
Mulligan: The act of drawing a new hand at the start of the game. Each player gets one mulligan per game.

At the beginning of the game, both players may decide whether or not they want to keep their starting hands. If a player doesn't want to keep his/her starting hand, s/he may shuffle that starting hand back into his/her deck and draw a new one. First the Corporation decides on a mulligan, then the Runner decides.

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