One suggestion i give to you that, please level of difficulty increase in a way that the learner not face to much thing in a single assignment. So, create assignment like that learner learn less thing but accurately. For example in this assignment you only build a relations between classes and marker on a map for only CityMarkerMap.java class and in the next module you implement LandMarker.java and so on. So, please this is my request in the future make assignments in a way that the Learner less thing but efficiently and accurately.
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