Common use of Initial Period of Exercisability Clause in Contracts

Initial Period of Exercisability. The Option will become exercisable with respect to the Option Shares in _______ installments. The following table sets forth the initial dates of exercisability of each installment and the number of Option Shares as to which this Option will become exercisable on such dates: Initial Date of Number of Option Shares Exercisability Available for Exercise -------------- ---------------------- The foregoing rights to exercise this Option will be cumulative with respect to the Option Shares becoming exercisable on each such date, but in no event will this Option be exercisable after, and this Option will become void and expire as to all unexercised Option Shares at, 5:00 p.m. (Lincolnshire, Illinois time) on _______________, ____ (the "Time of Termination").

Initial Period of Exercisability. The Option will become exercisable with respect to the Option Shares in _______ installments. The pursuant to the following table which sets forth the initial dates of exercisability of each installment and the number of Option Shares as to which this Option will become exercisable on such dates: Initial Date of Number of Option Shares Exercisability Available for Exercise -------------- ---------------------- 3/30/99 272,059 4/21/99 QUARTERLY THROUGH 1/21/01 51,011 6/30/99 QUARTERLY THROUGH 3/30/01 98,009 The foregoing rights to exercise this Option will be cumulative with respect to the Option Shares becoming exercisable on each such date, but in no event will this Option be exercisable after, and this Option will become void and expire as to all unexercised Option Shares at, 5:00 p.m. (Lincolnshire, Illinois time) on _______________MARCH 29, ____ 2004 (the "Time of Termination").

Initial Period of Exercisability. The Option will become exercisable with respect to the Option Shares in _______ installmentsIN TWELVE QUARTERLY INSTALLMENTS. The following table sets forth the initial dates of exercisability of each installment and the number of Option Shares as to which this Option will become exercisable on such dates: Initial Date of Number of Option Shares Exercisability Available for Exercise -------------- ---------------------- ------------------------ 04/21/98 QUARTERLY THROUGH 01/21/01 33,333 The foregoing rights to exercise this Option will be cumulative with respect to the Option Shares becoming exercisable on each such date, but in no event will this Option be exercisable after, and this Option will become void and expire as to all unexercised Option Shares at, 5:00 p.m. (Lincolnshire, Illinois time) on _______________OCTOBER 6, ____ 2003 (the "Time of Termination").

Initial Period of Exercisability. The Option will become exercisable with respect to the Option Shares in _______ installments. The following table sets forth the initial dates of exercisability of each installment and the number of Option Shares as to which this Option will become exercisable on such dates: Initial Date of Number of Option Shares Exercisability Available for Exercise -------------- ---------------------- The foregoing rights to exercise this Option will be cumulative with respect to the Option Shares becoming exercisable on each such date, but in no event will this Option be exercisable after, and this Option will become void and expire as to all unexercised Option Shares at, 5:00 p.m. (Lincolnshire, Illinois time) on _______________, ____ (the "Time of Termination").