Final answer:
The question seems to require information on literacy or the organization of words on a surface, but without further context, it is challenging to provide a definitive answer regarding the 'seat stone'.
Step-by-step explanation:
The question appears to be inquiring about the number of words that appear on a surface or tablet, which suggests a focus on literacy or linguistics within a practical application, such as creating an exhibit. Although the provided references discuss the physical properties and history of ancient stones, the actual question seems to pivot more towards a writing or literacy exercise rather than history or geology. Therefore, without additional context, it's challenging to determine a definitive answer regarding the 'seat stone' or the amount of writing expected on it.