Consider the following premises. For all x_12, if x_12 were a writer, then x_12 is a poet. For all x_12, x_12 will not read a book. For all x_12, x_12 is happy if and only if x_12 is a writer. For all x_12, if x_12 climbs a mountain, then x_12 is a poet. For all x_12, x_12 will read a book or x_12 is happy. Can we infer the following from them? For all x_12, x_12 is a poet.
 From the fact that for all x_12, x_12 will read a book or x_12 is happy, and that for all x_12, x_12 will not read a book we can infer that for all x_12, x_12 is happy. From the fact that for all x_12, x_12 is happy we can infer that for all x_12, x_12 is happy or x_12 will climb a mountain. From the fact that for all x_12, x_12 is happy if and only if x_12 is a writer we can infer that for all x_12, if x_12 were happy, then x_12 is a writer. From the fact that for all x_12, if x_12 were happy, then x_12 is a writer, and that for all x_12, if x_12 were a writer, then x_12 is a poet we can infer that for all x_12, if x_12 were happy, then x_12 is a poet. Finally, from the fact that for all x_12, if x_12 were happy, then x_12 is a poet, that for all x_12, if x_12 climbs a mountain, then x_12 is a poet, and that for all x_12, x_12 is happy or x_12 will climb a mountain we can infer that for all x_12, x_12 is a poet. Therefore, the answer is yes.