Ten bugs are arranged into
two rows of five bugs each. Move just four of them so that
five rows of four bugs appear. No option of two bugs at one
spot though a bug can be simultaneously a part of several
rows.
No two pearls from among those placed in the cells or a grid are in the
same row, column, or diagonal. Moving three of them it's still possible to
preserve the no-two-pearls-in-line arrangement.
Color the points of a "web"
into two colors - red and blue - in such a way that do not allow any
sequence of three points of the same color be found in a single line.
