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
There many obstacles builders Empire State Building faced attempting allow dirigibles dock One obstacle stress building dirigible The stress dirigibles load wind pressure would transmitted way buildings foundation feet So steel frame Empire State Building would modified strengthened Another obstacle dirigibles outside US use hydrogen rather helium hydrogen highly flammable The third obstacle winds top building constantly shifting due violent air currents Even dirigible tethered mooring mast back ship would move around uncontrollably Lastly last obstacle existing law airships flying low urban areas This would make illegal ship ever tie building even approach area These many obstacles builders Empire State Building faced attempting allow dirigibles dock
user
Your evaluation score is: 4.0
assistant