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button#b1 { top:20%;left:25%; nav-index:1; nav-right:#b2;nav-left:#b4; nav-down:#b2;nav-up:#b4; } button#b2 { top:40%;left:50%; nav-index:2; nav-right:#b3;nav-left:#b1; nav-down:#b3;nav-up:#b1; } button#b3 { top:70%;left:25%; nav-index:3; nav-right:#b4;nav-left:#b2; nav-down:#b4;nav-up:#b2; } button#b4 { top:40%;left:0%; nav-index:4; nav-right:#b1;nav-left:#b3; nav-down:#b1;nav-up:#b3; }
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