Draw all of the stereoisomers that are possible for 1,2,3-cyclopentanetriol. Label their chirality centers and say which are enantiomers and which are diastereomers.

(Some of the isomers contain a "pseudoasymmetric center," one that has two possible configurations, each affording a different stereoisomer, each of which is identical to its mirror image. Such stereoisomers can only be distinguished by the order of attachment of R versus S groups at the pseudoasymmetric center. Of these the R group is given higher priority than the S, and this permits assignment of configuration as r or s, lowercase letters being used to designate the pseudoasymmetry.)

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