Clarify vertex merging explanation in index.html

Author: Gmac4247

index.html

@@ -3981,7 +3981,7 @@ <h3 style="margin:12px;">The other idea is the cube dissection.</h3>
 The cube has 8 vertices, each pyramid has 5. Three pyramids have 3 × 5 = 15 in total.
 <br>
 <br>
-<strong>Each vertex of a real physical cube is a point that can't be split into 3 points without duplicating. The other way around, 3 points can't be merged into 1 without distortion.</strong>
+<strong>Each vertex of a real physical cube is a point that can't be split into 3 points without duplicating. The other way around, 3 vertices of the pyramids can't be merged into 1 without distortion.</strong>
 <br>
 If we dissect the cube, we need to designate each shared vertex to be a part of either one pyramid, or another. 
 <br>