Compare two newline-separated lists. Show Left only, Right only, and Shared items. Inputs are not overridden.
Compare two lists and derive three sets: Left-only, Right-only, and Shared. Items are compared by exact line match.
Two inputs, one item per line. Empty lines are treated as items and are compared literally.
Three text areas are filled with results, preserving first-appearance order per input; your inputs are never modified.