Duplicate line remover: Preserving order while removing duplicate lines — Worked Scenario

What this scenario actually checks

Turn a pasted list into unique entries without sorting away its original sequence. By default, lines must match exactly. Optional trimming and case-insensitive matching help reconcile copied lists, and the blank-line option removes empty separators when you want a compact result.

This walkthrough focuses on preserving order while removing duplicate lines. It follows the published tool inputs, not a new formula or an automatically verified legal, financial, medical or engineering determination.

Start by preparing the right inputs

Paste up to 100,000 UTF-16 units. Line endings including CRLF, CR, LF and Unicode line separators are normalized to LF in the result. Without options, spaces and letter case are significant. The first occurrence of each complete line is kept in the same order.

Before copying the example, confirm that each entered unit, date, dimension and default matches your real task. Changing only a visible number without revisiting its assumptions can change what the answer means.

• Paste up to 100,000 UTF-16 units. Line endings including CRLF, CR, LF and Unicode line separators are normalized to LF in the result.
• Without options, spaces and letter case are significant. The first occurrence of each complete line is kept in the same order.
• Trim lines removes surrounding whitespace before matching and output. Ignore case compares lowercase keys but retains the spelling of the first occurrence. Remove blank lines skips whitespace-only lines.

Worked example with the calculator

Use the following input values: Apple Banana Apple apple.

The example output is Apple Banana (Ignore case). The last two lines match the first line after lowercasing; the first spelling and order are preserved.

Treat this as a reproducible example, not a result to reuse with different measurements.

What can change the answer

Trim lines removes surrounding whitespace before matching and output. Ignore case compares lowercase keys but retains the spelling of the first occurrence. Remove blank lines skips whitespace-only lines. If blank lines are retained, at most one remains, including an empty line from a trailing line separator. No Unicode normalization, sorting or fuzzy matching is performed; text stays in your browser.

The numerical result is valid only under the stated model and input definitions.

Before using the result for a real decision

For preserving order while removing duplicate lines, check the original measurements and input units, and save the assumptions alongside any number you share.

Where legal rules, official allowances, equipment ratings or contractual conditions matter, consult their current authoritative documents. An illustrative estimate is not a substitute for that verification.

• Reproduce the example before changing inputs
• Check all units and assumptions, including any default values
• Verify official or manufacturer-specific requirements outside the calculator