According to basic strength,If true enter 1, else enter 0.
${S e H}^{-} < {S H}^{-} < {O H}^{-}$

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Solution

The increasing order of acid strength is $H_{2} O < H_{2} S < H_{2} S e$ .
Thus, water is the weakest acid and $H_{2} S e$ is the strongest acid.
Weakest acid (water) has strongest conjugate base $(O H^{-})$
and strongest acid $(H_{2} S e)$ has weakest conjugate base ${S e H}^{-}$ .
Hence, the increasing order of base strength is ${S e H}^{-} < {S H}^{-} < {O H}^{-}$

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