---
title: "Combining Operators"
url: "https://help.quartet.pro/en/article/combining-operators"
language: "en"
last_updated: "2025-12-09T22:08:52.743Z"
---

# Combining Operators

Quartet rules for combining multiple operators

There are rules to follow when combining operators. Generally, all operators within a set of parentheses must be equal, and additional different operators must be used in separate or additional nested parentheses.

-   Each operator must have at least two operands

✔️ **(water AND liquid)** is valid

✔️ **(car OR vehicle OR train)** is valid

❌️ **(NOT liquid)** is invalid

-   Within the same clause (parentheses), all operators must be exactly equal

✔️ **(water AND liquid AND oxygen)** is valid

❌ **(antenna OR emitter AND signal)** is not valid

Instead, an order of operations must be defined for different operators such as

✔️ **(antenna OR (emitter AND signal))**

or

✔️ **((antenna OR emitter) AND signal)**

-   When using Proximity Operators, the order of operations must also be defined even if all operators are equal

❌ **(window 3D frame 3D glass)** is not valid

✔️ **((window 3D frame) 3D glass)** is valid

❌ **(high 2W speed 5W train)** is not valid

✔️ **((high 2W speed) 5W train)** is valid

-   The AND and NOT operators cannot be combined with Proximity Operators ( #W , #D ), however the OR operator can be combined with Proximity Operators:

**✔️ (high 2D (speed OR velocity))** is valid

❌ **((satellite NOT cell) 2W phone?)** is not valid

✔️ **((Satellite 2W phone?) NOT (Cell 2W phone))** is valid

❌ **((wind AND green) 4D generator)** is not valid.

✔️ **(wind 4D Generator) AND (green 4D generator)** is valid