If all true statements are defined as non-contradictory, then you can ask more meaningful fuzzy logic questions about the relevance of several tautologies for applying to a specific real world phenomena. To do this you need a survey or poll of the environment and a survey or poll for determining how much the teutologies matter. For example.

Consider the following boolean true false claims we hold to be true and consider their relevance for use in locating humans statistically: our first rule or fuzzy logic heuristic is to take the first tautology that seems relevant and apply it to see if it matches results.

For example consider these specefic logic systems:

1) The complete theory of gravity as discovered by Neuton determines that statistically humans have mass and density approximately equal to water. Gravity combined with density predicts that humans should be located in a region of space centered on the gravitational center of the planet and evenly distributed in a sphere with all air above every human and all solid matter below humans. Evidence of humans living underground or flying on airplanes above any air or with air separating humans from the center of gravity is a violation of this theory of gravity and density and random distribution mathematics.

2) The incomplete theory of plate tectonics and geography determines that people in some places their will be air closer to the center of gravity than at other places. The idealized sphere distribution of humans has bumps and valleys caused by plate techtonics asserts that some humans on mountain tops will be at local equilibrium above other air molecules in valleys. Humans at one latitude and longitude can be above the air in some other latitude and longitude.

3) The incomplete theory of human behavior says that humans can move and defy uniform distribution rules about their statistical probabilistic location relative to the center of gravity. People go into rocket ships and can even be found above the air which is in complete contradiction to the theory of gravity considered as the only teutology theory of relevance.

4) The theory of geometry and angular momentum combined with gravity proves conclusively that humans must be located exclusively in a squished sphere shape distribution (oblate) with their distance from the the center of gravity determined solely by their relative density compared to the rest of the material in the the planetary space under consideration.

Conclusion: not all of these verifiable true boolean statements are equally valuable and equally relevant. Some of them can be discarded or are more usably incomplete than others. Utility value of any logic system is determined by the use case and boolean logic components can be added and removed from consideration and time consuming calculations based on their predictive ability for the particular use case. To determine, in this example, the most relevant and important logic systems I would like anyone who reads this to rank order the logic system choices from most relevant and useful to least relevant and useful. The distribution of your rank order voting will determine the utility value of the the multiple non-contradictory tautology logic systems comparatively. You may also add a 1 (one) new option to this voting poll on relevance and other can rank your additional logic framework. When we have enough votes we start evolving and deleting logic systems from our poll until we have a high level of agreement or a stable equilibrium of voting distribution.

Boolean logic tells us what is possible. Fuzzy logic tells us what is relevant and usable.