119. Condition must be strictly fulfilled. An ulterior bequest of the kind contemplated by section 118 cannot take effect unless the condition is strictly fulfilled. 120. Original bequest not affected by invalidity of second. If the ulterior bequest is not valid, the original bequest is not affected by it. 121. Bequest conditioned that it shall cease to have effect in certain cases. A bequest may be made with the condition superadded that it shall cease to have effect in case a specified uncertain event shall happen or in case a specified uncertain event shall not happen. 122. Condition must not be invalid under section 107. In order that a condition that a bequest shall cease to have effect may be valid, it is necessary that the event to which it relates is one which could legally constitute the condition of a bequest as contemplated by section 107. 123. Result of legatee rendering impossible or indefinitely postponing act for which no time specified. Where a bequest is made with a condition superadded that, unless the legatee shall perform a certain act, the subject matter of the bequest shall go to another person, or the bequest shall cease to have effect, but no time is specified for the performance of the act, if the legatee takes any step which renders impossible or indefinitely postpones the performance of the act required, the legacy shall go as if the legatee had died without performing the act. 124. Performance of condition, precedent or subsequent. Where a will requires an act to be performed by the legatee within a specified time, either as a condition to be fulfilled before the legacy is enjoyed, or as a condition upon the nonfulfillment of which the subject matter of the bequest is to go over to another person, or the bequest is to cease to have effect, the act must be performed within the time specified unless the