### Tattoo Pioneers were Scratchers
| **Definiendum** | **Definiens** |
|:-------------------------------------------:|:-------------------------------------------------------- |
| **S** | one (x) is a scratcher |
| **L** | one (x) tattoos without a license |
| **H** | one (x) tattoos without observing basic health standards |
| **U** | one (x) tattoos without having undertaken apprenticeship |
| **t** | original trailblazers of modern tattooing |
P1) One is a scratcher if, and only if, one tattoos without a license and/or one tattoos without observing basic health standards and/or one tattoos without having undertaken apprenticeship.
(∀x(Sx↔Lx∨Hx∨Ux))
P2) The original trailblazers of modern tattooing tattooed without licenses.
(Lt)
P3) The original trailblazers of modern tattooing tattooed without observing basic health standards.
(Ht)
P4) The original trailblazers of modern tattooing tattooed without having undertaken apprenticeship.
(Ut)
C) Therefore, the original trailblazers of modern tattooing were scratchers.
(∴St)
[Proof Tree](https://www.umsu.de/trees/#(~6x(Sx~4Lx~2Hx~2Ux)),(Lt),(Ht),(Ut)|=(St))
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