Progesterone receptor modulators of formula I, or a pharmaceutically acceptable salt thereof,wherein R1, R2, R3, R4, R5, R6 and R7 are as defined herein, are useful for contraception and hormone replacement therapy are described. The fuel tank has an upper tank and a lower tank which are respectively composed of a thermoplastic synthetic resin. The apparatus further includes means for selecting the size of the RLC PDU. The layered catalyst composites of the present invention have a sulfur oxide absorbing layer before or above a nitrogen oxide absorbing layer. The authorization may be based on identification information transmitted by the non-volatile storage device to the service provider system over the secure communication channel.