Task gallery: Indicate what tasks that needs more solutions

[neoneye]

Problem

Every task in the original ARC dataset has 1 or more solution.

However it's the same few tasks that users trend to solve, so several solutions exists for these tasks.

The remaining tasks gets no attention. These tasks continues to have just 1 solution. This is insufficient for use as training data.

Solution

Highlight the thumbnails that needs more solutions.