<span class="searchmatch">operativsystemens</span> definite genitive plural of operativsystem...
<span class="searchmatch">operativsystemen</span> definite plural of operativsystem...
operativsystems definite operativsystemet operativsystemets plural indefinite operativsystem operativsystems definite <span class="searchmatch">operativsystemen</span> <span class="searchmatch">operativsystemens</span>...