Algonquin Corp. has issued and has outstanding 100,000 shares of common stock. Four stockholders own 60,000 of these shares, and for the past six years they have nominated a slate of candidates for membership on the board, all of whom have been elected. Sergio and twenty other shareholders, owning 20,000 shares, are dissatisfied with corporate management and want a representative on the board who shares their views. Explain under what circumstances Sergio and the twenty other shareholders can elect their representative to the board.