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we can use a single iteration of for loop like this
- Y January 17, 2013{{
def validate_phone_number(phone_number):
if phone_number[0] == '4'
four_flag = True
is_valid = True
for i,digit in phone_number:
if digit == '7' || digit == '2' || digit == '9':
is_valid == False;
break
elif digit == '4' and four_flag == False:
is_valid == False
break
elif i != 0 and phone_number[i-1] == phone_number[i]:
is_valide == False
break
return is_valid
}}