java - want to create tree node and print following pattern on console -

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enter image description here b1 a1 b2 c1 a2 c2

want print pattern dynamically. tried using node represent positions left,right

        node<integer> root = new node<integer>(2);         node<integer> n11 = new node<integer>(7);         node<integer> n12 = new node<integer>(5);         node<integer> n21 = new node<integer>(2);         node<integer> n22 = new node<integer>(6);         node<integer> n23 = new node<integer>(3);         node<integer> n24 = new node<integer>(6);         node<integer> n31 = new node<integer>(5);         node<integer> n32 = new node<integer>(8);         node<integer> n33 = new node<integer>(4);         node<integer> n34 = new node<integer>(5);         node<integer> n35 = new node<integer>(8);         node<integer> n36 = new node<integer>(4);         node<integer> n37 = new node<integer>(5);         node<integer> n38 = new node<integer>(8);          root.left = n11;         root.right = n12;          n11.left = n21;         n11.right = n22;         n12.left = n23;         n12.right = n24;          n21.left = n31;         n21.right = n32;         n22.left = n33;         n22.right = n34;         n23.left = n35;         n23.right = n36;         n24.left = n37;         n24.right = n38;

the program should accept position dynamically


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