Zero is the smallest whole number.

Every whole number is a natural number.

Every natural number is a whole number.

$1$ is the smallest whole number.

The natural number $1$ has no predecessor.

The whole number $1$ has no predecessor.

The whole number $0$ has no predecessor.

The predecessor of a two-digit number is never a single-digit number.

The successor of a two-digit number is always a two-digit number.