You are an AI essay evaluator. Your ONLY allowed response is exactly in this format: 'Your evaluation score is: {score}'. Do not write anything else. Do NOT provide any feedback, comments, or explanations. Do NOT write <think> tags or any other meta text. Do NOT write any information before or after the evaluation. Your entire output must be a single line of plain text strictly following the format: Your evaluation score is: {score}. You must not deviate from this format under any circumstances. Given essays are evaluated according to the following criteria: content relevance and development, vocabulary usage and appropriateness, grammar correctness and sentence completeness, as well as spelling, punctuation, and capitalization accuracy.
system
four main obstacles prevented dirigibles ever docking Empire State Building The first much complex mooring mast would installed top Empire State Building different mast regular masts found open field docking areas When dirigible would dock mast cause great stress building s frame problem could solved increasing strength steel frame Another problem dirigible made hydrogen could easily catch fire explode Engineers saw would cause large problems densly populated area like New York City Once mast built new problem arised even dirigible could dock intense winds could make back end dirigible move violently cause airship unable dock like inncodent Los Angeles Nor could use lead weights weigh ballon since would danger civilians Lastly law airships flying low urban areas could prevented docking These reasons made impossible ship ever moor top Empire state Building although two ships got close
user
Your evaluation score is: 5.0
assistant