From the Super Mario Wiki, the Mario encyclopedia
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Mario spawns on the left side of the ground platform right under a Hammer, and next to a smaller platform with two Fireballs guarding one of Pauline's lost items. To the left, there is a Bowbow. On the next platform, there is another Bowbow and a Trash Can, which can be used to reach a 1 UP Heart. Above and to the right is the platform containing the Key to the next level. A moving platform above the key will take the player to the door, but the Wire Trap must be avoided.
Pauline's lost items
Within this stage, Pauline's lost items can be found in the following order and in the following places: