Consider the following sorites No S are D All O are S All R

Consider the following sorites:

No S are D.

All O are S.

All R are O.

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No R are D.

Supply the missing intermediate conclusion necessary to render a valid sorites:

BAsed on statement second and third, it is concluded that fourth missing statement must be

\" All R are S \"

Only then the resulting statement \"No R are D\" is valid because No S are D initially given. So underlined is missing statement.