Why are there more TriangleIndices than Postions in resource whose key is CubeSide06

[usernamedd]

the path is "Animation/AnimationExamples/App.xaml".

the code is below :
<MeshGeometry3D x:Key="CubeSide06" TriangleIndices="0,1,2 3,4,5 6,7,8 9,10,11 " Normals="-1,0,0 -1,0,0 -1,0,0 -1,0,0 -1,0,0 -1,0,0 " TextureCoordinates="1,0 1,1 0,1 0,1 0,0 1,0 " Positions="-0.5,-0.5,0.5 -0.5,-0.5,-0.5 0.5,-0.5,-0.5 0.5,-0.5,-0.5 0.5,-0.5,0.5 -0.5,-0.5,0.5" />
from my view the element count in Postions is 6 but in TriangleIndices there is 11 , isn`t it wrong?