What University for my son?

What University for my son?

B:
D: Let my son go to a very expensive University
A:
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C:
D':

In order to I must and in order to I must Let my son go to a very expensive University. But, in order to I must also and in order to I must . I can't both Let my son go to a very expensive University and .

RelationAssumption(s)Injection(s)