Geometric Alphabet with Color Accents

Create a typography specimen sheet displaying the complete uppercase English alphabet (A-Z) arranged in four rows on a clean white background. The font style is a bold, geometric sans-serif with sharp angles and uniform stroke width. Each letter features a single, small colored square or rectangular accent placed at a specific terminal point, joint, or corner of the glyph. These accents vary in color across the set, including bright red, cyan, yellow, lime green, orange, magenta, purple, and blue. The layout should be spacious and grid-like, showcasing the unique 'glitch' or 'highlighted node' aesthetic of this custom typeface design.