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Description: A singleton word is a word. (Contributed by Mario Carneiro, 26-Feb-2016)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | s1cld.1 | ||
| Assertion | s1cld |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | s1cld.1 | ||
| 2 | s1cl | ||
| 3 | 1 2 | syl |