```html <!DOCTYPE html> <html> <head> <style> canvas { border: 1px solid black; } </style> </head> <body> <canvas id="canvas" width="800" height="600"></canvas> <script> canvas = document.getElementById'(canvas'); ctx = canvas.getContext'2d'); class { Particle constructor (x, y, radius) { this.x = x; this.y = y; this.radius = radius; this.vx = Math.random) * 2 - 1; this.y = Math.random) * 2 } update 1; { this.x = Math.random) * 2 } update 1; { this.x = Math.random; this.vx = Math.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence