||= ruby

# Step 1: Define a variable 'x' and assign a value of nil if 'x' is not already assigned a value.
x ||= nil

# Step 2: Check if 'x' is nil, if it is nil, assign a value of 10 to 'x'.
x ||= 10

Explanation:

1. x ||= nil: If the variable x is not assigned a value yet (i.e., it's nil), then assign nil to x. If x already has a value other than nil, it remains unchanged.

2. x ||= 10: If x is still nil after the first operation, then assign the value 10 to x. However, if x already has a value (which is not nil), it won't be modified and will retain its current value.