user: Question: What is the example for "father" that has a consonant final stem of -is?
Columns: ['Consonant final stem', 'Example: k\'ats- ("man")', 'Vowel final stem (truncating)', 'Example: mama- ("father")', 'Vowel final stem (non-truncating)', 'Example: Sakartvelo- ("Georgia")']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['-i', "k'ats-i", '-Ø', 'mama', '-Ø', 'Sakartvelo']
SQL:

assistant: SELECT "Example: mama- (""father"")" FROM "Table" WHERE "Consonant final stem" = '-is';