sentences: faster bedrock an decrease in sail
docs: if bear_down_on occurs then sail occurs. fore_and_aft_sail is sail. spanker is fore_and_aft_sail. sinking is decrease. constant_speed_propeller is propeller. headsail is sail. constant_speed_propeller is variable_pitch_propeller. bedrock is rock. staysail is fore_and_aft_sail.