{?P rdfs:subPropertyOf ?R. ?S ?P ?O} => {?S ?R ?O}.
(:jema :loves :john}.
(:likeAsFriend subPropertyOf :loves)
{:jema :likesAsFriend :sue}.
{:jema :likesAsFriend :man1}.
{:jema :likesAsFriend :man2}.
{:jema :likesAsFriend :man3}.
# add 1000 more men

# now query
{?Who :LikeAsFriend :john}.