Assume we have a two$-$dimensional parity. For example, below we have $6$ bytes of data $($one by in each row$).$ The parity bit is the last bit in each row.

The parity byte is calculated looking at the vertical bits $($all bits in the same position from each byte$).$ Complete the shaded boxes by adding the parity bit for each byte, then adding the parity byte. Assume EVEN parity.

Parity bit

Parity byte

Parity byte in hexadecimal: