The Power of the Negative Command

The negative command works here in a narrower and quite specific way: use it to constrain what kind of source is acceptable, which is the one prohibition this tool enforces well. "Do not cite tourism sites", "do not use vendor-published research", "do not give me a figure without a date" all genuinely change the answer. For the two creative examples, the bans are about tone and voice, and that is not what this tool does - the comparison table, though, is the one case where it may be the best of the four.

• Ban source types, not words - that constraint it honours.
• Ban undated figures and vendor-published research explicitly.
• Ban the lifestyle sources that dominate city comparisons.
• Do not expect tone or style bans to hold.
• For the comparison, this may be the best of the four tools.

Do not draft the email here. A tone ban - no passive-aggression, no contractions, no implied threats - is a style constraint, and this tool will give you a sourced summary of payment-reminder practice rather than an email. Write it in Claude, ChatGPT or Gemini.

There is one research question worth asking first, though, because the bans in that email are partly about what you are legally and commercially able to say. My client in India is 15 days overdue on an invoice.

1. What do Indian law and standard commercial practice allow regarding late payment interest and charges? Cite the provisions - the Interest Act, the MSMED Act if either party is a registered MSME, and anything in the Sale of Goods or Contract Act that applies. Dates included. I banned mentioning late fees in the email, and I want to know whether I had a right I was giving up.
2. If my business is a registered MSME, what specific protections and timelines apply to delayed payments? Cite the MSMED Act provisions and the Samadhaan facility. This is the single most useful thing on this list and most small businesses in India do not know it exists.
3. What is documented about effective practice in collecting overdue B2B payments without damaging the relationship? Cite credit management or industry sources rather than template blogs - and specifically, do not cite invoicing software vendors' content marketing, which dominates these results and is written to sell a product.
4. At what point does an overdue invoice in India typically justify formal escalation, and what are the actual steps - demand notice, Samadhaan, summary suit? Cite the procedure with its source.
5. What is published about average B2B payment delays in India by sector? Cite surveys with dates. Fifteen days may be unremarkable or may be a warning sign, and I would like to know which.

Cite everything with dates. Do not give me a figure without a source. Where something turns on whether a party is an MSME, say so rather than giving a general answer.

Then write the email in another tool, with your ban list - and use answer 1 to decide whether "no mention of consequences" is a ban you actually want to keep.

This is the one example in this chapter where Perplexity may be the best of the four tools, because the ban I care about most is a ban on a kind of source - and that is the prohibition this tool honours properly.

I am a tech entrepreneur choosing between Hyderabad and Bangalore as a startup headquarters. I need the business comparison, sourced. Research each factor separately.

1. **Office space cost.** Current commercial rentals and co-working rates in the main business districts of both cities - HITEC City and Gachibowli against Whitefield, Outer Ring Road and Koramangala. Cite published commercial property reports with their quarter and year.
2. **Talent pool.** What is documented about the size of the engineering talent pool, graduate output, and salary levels for software engineers in each city? Cite NASSCOM, state IT department data, published salary surveys or census data, each with its date.
3. **Government incentives.** What is currently offered to startups by Telangana and by Karnataka - schemes, subsidies, incubation, single-window clearances? Cite the official scheme page and state the scheme's current status and date. Flag any scheme you cannot confirm is still live; this is the factor most likely to be out of date and the most expensive to get wrong.
4. **Attrition and competition for hires.** What is reported about tech attrition rates in each city? Cite industry reports with dates.
5. **Ecosystem density.** What is documented about the number of startups, active investors and funding raised in each city? Cite reported data with the period it covers.
6. **Practical operating friction.** What is documented about commute times, office availability, power reliability and internet infrastructure? Cite measured data rather than impressions.

**Do not cite these - this is the important instruction:**

- No tourism, travel or lifestyle sites. The top results for "Hyderabad vs Bangalore" are lifestyle articles about food and nightlife, and they are useless to me. If you discard sources for this reason, tell me you did.
- No real estate brokers' or co-working operators' own marketing pages as the source for cost figures. Use published market reports instead.
- No undated figures. A rental rate or salary number without a quarter attached is not usable. If you cannot date it, do not give it to me.
- No state government promotional copy presented as neutral data. Both states market themselves hard. Take the scheme details; leave the claims about being the best destination for startups.
- No figures from articles that do not name their own source.

For each answer: the source, the date, and whether it is independent or an interested party. Where the two cities' data comes from different kinds of source and is not actually comparable, say so - that is a real finding and a table would hide it.

Then tell me which factor the evidence suggests actually decides this for an early-stage company, and what no amount of research can tell me - where my first customers are, where my co-founder lives. Save it in a Space; I will come back as the schemes change.

Do not write the poem here. Nothing about this task suits an answer engine: the bans are tonal, the output is creative, and a poem with citations is not a poem. Write it in Claude, ChatGPT or Gemini.

I will say plainly that for this example the research step is mostly optional - a monsoon poem does not need sourcing. But two of these questions genuinely help with the ban list, because the reason to ban a phrase is that it has been used to death, and you can actually find out which ones those are.

1. What has been written about the cliches of monsoon writing in Indian English literature? Cite critics and essayists. Which images and phrases do reviewers identify as exhausted? This turns my guessed ban list into an evidenced one.
2. What is petrichor, actually? Cite the original scientific work naming it and any later research on the compounds involved - geosmin, plant oils, the role of bacteria. Use Academic focus. A poem built on accurate specifics beats one built on a general impression of a smell, and this is the kind of precision a search tool gives you and a writing tool guesses at.
3. What is documented about the monsoon's arrival in Hyderabad and the Deccan specifically - typical onset dates, how the temperature breaks, what actually happens in the first hours? Cite IMD data or climatological sources. The specifics of this place rather than a generic monsoon.
4. Which poets have written well on the Indian monsoon, in English and in translation from Indian languages? Cite the poems and collections. I want to read three of them before writing mine, which will do more for the poem than any prompt will.
5. What is written about the monsoon in classical Indian poetics - the varsha season in Sanskrit and Prakrit literature, Kalidasa's Meghaduta, the conventions of viraha? Cite scholarship. Worth knowing that the melancholy I have banned is a thousand-year-old convention, not a modern habit.

Do not cite travel blogs, tourism boards or content farms - this subject is buried under them. Cite literary criticism, scholarship and meteorological sources, and tell me when you have discarded something for being promotional content.

Then write the poem elsewhere with the ban list. Use answer 1 to replace my guessed cliche bans with evidenced ones, and answer 2 for one accurate physical detail instead of a general gesture at a smell.