A sample (i.e. not necessarily the perfectly correct one! ) ERD is given below (Note that key attributes are not listed but it should be straightforward for you to figure out which should be the keys. You may add one or two attnibutes that are not drawn in the ERD. For example, add a "Company Name" to the Company entity. ). Please transform the ERD into relations. suggest that you use "unique" names for key attributes. In this way, you do NOT need to draw those arrows)! Drug ID PatientPatient ID Has Drug Prescription ID Ct 0 Pharmacy Sale Doctor ID Doctor Sales Pharmacy ID INFORMATION SYSTEMS ANALYSIS AND DESIGN Page 4 of 5