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Straight forward documentation:

Opcode	Name	Name (Chicken)	Description
0	exit	axe	Stop execution
1	chicken	chicken	Push the string chicken onto the stack
2	add	add	Add two top stack values.
3	subtract	fox	Subtract two top stack values.
4	multiply	rooster	Multiply two top stack values.
5	compare	compare	Compare two top stack values for equality, push truthy or falsy result onto the stack.
6	load	pick	Double wide instruction. Next instruction indicates source to load from. 0 loads from stack, 1 loads from user input. Top of stack points to address/index to load onto stack.
7	store	peck	Top of stack points to address/index to store to. The value below that will be popped and stored.
8	jump	fr	Top of stack is a relative offset to jump to. The value below that is the condition. Jump only happens if condition is truthy.
9	char	BBQ	Interprets the top of the stack as ascii and pushes the corresponding character.
10+	push	(Empty)	Pushes the literal number n-10 onto the stack.

Specification

Every line in the program is inspected for chickens, and the corresponding number of chickens are pushed onto the stack. Execution is done directly on the stack, which may make the program susceptible to arbitrary chicken injection attacks.

You can write chicken and fried randomly. "fried chicken" is same as "chicken chicken" or "chicken fried".

But you have to put atleast 1 fried in your code.