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Case 1: Island never splits.
Case 2: Island splits when ocean rises 3 feet.
Case 3: Island splits when ocean rises 3 feet.
Case 4: Island splits when ocean rises 4 feet.
Case 5: Island splits when ocean rises 10 feet.
Case 6: Island splits when ocean rises 7 feet.
Case 7: Island never splits.
Case 8: Island splits when ocean rises 10 feet.
Case 9: Island splits when ocean rises 10 feet.
Case 10: Island splits when ocean rises 261 feet.
Case 11: Island splits when ocean rises 104 feet.