emergency telephone number

Deductions

• emergency telephone number is for example 911 ⇐ (911 is a emergency telephone number), (is a is inverse of is for example)
• emergency telephone number is for example 999 ⇐ (999 is a emergency telephone number), (is a is inverse of is for example)
• emergency telephone number is for example 112 ⇐ (112 is a emergency telephone number), (is a is inverse of is for example)