Databases - Relational Calculus

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    Not understand the question properly It looks like find x from s(x) and y from s(y) and check y<=x

    then there are many possible combination of this as 3<=3,4,5,6,7,10,11,19,18 4<=4,5,6,7,10,11,19,18 5<=5,6,7,10,11,19,18 6<=6,7,10,11,19,18 7<=7,10,11,19,18 10<=10,11,19,18 11<=11,19,18 18<=18,19 19<=19

    total 45 but it is wrong anyone explain plz