You need to answer the question 'Are the given steps in order?', given a set of steps describing a process. Your answer must be either Yes or No. If the answer is No, that means the steps are out of order and do not make sense in the order they are in. If the answer is Yes, that means the steps are in order and make sense in the order that they are in. A set of steps are not in order if the steps reference information that is introduced in a later step

Input: Consider Input:  ['Coal pollution enters clouds', 'Pollution from the coal goes into the sky', 'People burn coal for heat or electricity', 'The polluted rain becomes acid rain.', 'People dig up coal from the ground', 'Clouds rain over an area'] 

Output:   No  


Input: Consider Input:  ['Batteries are put in a flashlight', 'The flashlight is turned on', 'Two contact strips touch one another', 'A circuit is completed between the batteries and the lamp', 'The lamp in the flashlight begins to glow', 'The reflector in the flashlight directs the lamp's beam', 'A straight beam of light is generated', 'The flashlight is turned off', 'The circuit is broken', 'The beam is no longer visible.'] 

Output:   Yes  


Input: Consider Input:  ['Oxygen diffuses from alveoli in the lungs to the bloodstream', 'The lungs remove oxygen from the air', 'Hemoglobin in red blood cells attaches to the oxygen', 'Oxygen diffuses into cells from capillaries.', 'Red blood cells carry oxygen all around the body', 'Air goes into the lungs'] 


Output:   No  


