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one fable-low hijack cell

pair apl / factor envelope en_pipe ordering BA effort low

English with pipe '|' — '{X} | {Y}'

response (200 chars)

# Factorial in APL

In APL, factorial is a **built-in primitive**: `!`

## Monadic use (factorial)

```apl
      !5
120
      !0
1
      !10
3628800
```

It works on arrays too:

```apl
      !1 2 3 4

neighbors

ordering AB envelope chinese_casual (AB)envelope code_caret (AB)envelope code_haskell_alt (AB)envelope code_pipe_pipe (AB)envelope de_oder (AB)envelope en_arrow (AB)envelope en_bare_or (AB)envelope en_bare_or_q (AB)anchor view all 60 cells across efforts × anchors