List the clues (at least 4) Dupin gives to how he solved the case.

Dupin then reveals a sketch he made of the bruises and fingernail marks on the victim's throat, which indicate the presence of a hand that is too large for a man and exactly matches the paw of an Ourang-Outang. An Ourang-Outang, according to the narrator, would have the brutality and the voice to fit the identity of one of the intruders. The other man, who was heard to shout "mon dieu," must have been horrified and probably tried unsuccessfully to recapture the animal. Dupin suspects that the Frenchman is probably innocent, and has put out an advertisement claiming that he has captured an Ourang-Outang and wishes to return it to its owner. Next to the lightning rod at the Rue Morgue, Dupin finds a ribbon featuring a sailor's knot that is common among the Maltese, so he deduces that the man is probably a sailor from a Maltese ship. As Dupin predicts, a French sailor arrives to pick up the animal, but Dupin locks the door and takes out his pistol, commanding the sailor to tell the truth about the deaths at the Rue Morgue. Dupin tells the sailor that he believes the sailor is innocent but wants him to confess his knowledge so that Le Bon will not be falsely charged with murder.