Typo in Boolean expression in the "NAND Gate Method" page

[schezfaz]

Description

The boolean expression present on the [NAND Gate Method] page is correct as the rest of the steps do not follow through with the current expression.

Steps to reproduce the behavior:

1. Go to 'https://learn.circuitverse.org/docs/nand_gate_method.html#simplification'
2. F(A,B,C,D) has an extra variable 'E' on the R.H.S

Expected behavior

'E' parameter should not be present as F is a function of only 4 variables: A,B,C,D

Screenshots

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Working on it.