(1) -> SI ==> Set Integer
                                                                   Type:
Void
(2) -> SSI ==> Set SI
                                                                   Type:
Void
(3) -> si:SI := set [2]

   (3)  {2}
                              Type: Set(Integer)
(4) -> subset?(si,si)

   (4)  true
                              Type: Boolean
(5) -> ssi: SSI := set [si]

   (5)  {{2}}
                              Type: Set(Set(Integer))
(6) -> subset?(ssi,ssi)

   (6)  false
                              Type: Boolean

Why does (6) give false? Either that is a bug or I must be doing
something wrong. But what?

Ralf

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