???? Conventions ??????? ???? ????? ??? undertakings ??? ????? long. ???? ??? ????????? ?????????? ??? party ???? relates to upkeep machinery, and details ????? formal. ?????? ??? ????????? ?? ???? ????????? ??? sides and clarifying responsibilities ?? ??? Aids ?? ?????? quality ???????? ??????

???? ??????? ???? ??????? ????? ?????? ????? ??????? ?? ???????. ????? ??? ???????? ????? ?????? ?? ?????? ???????. ????? ?????? ??????? ?? ????? ????? ????? ??????? ????? ???? ??????? ?????? ???????. ???? ??? ??? ????? ??????? ????? ????? ??????? ???? ????? ????? ??????? ?????? ????? ?????