SanDisk (SNDK), a maker of removable memory cards, gave off multiple sell signals before sinking fast in early 2006. The stock shaped a cup-without-handle base starting in November 2005. The pattern formed after the stock soared 125% from its breakout above a 29.13 buy point of a prior long base. It’s debatable as to whether the new base was a risky fourth-stage pattern or a more hopeful second-stage structure.