1 works with 2,3,4,5

2 works with 7,8

matrix - n x n search horiz, vert, diag


whenever you visit a location, and then visit a connected location, you do not want to revisit the old as you continue to find adjacent cells

FINAL: can only be assigned once

getOrDefault(Object key, V defaultValue) Returns the value to which the specified key is mapped

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