1. /f/ /v/ Strong Unvoiced Does not lengthen vowel in front Weak Voiced

2. /f/
off
/v/ of

3. /f/
off
fan
/v/ of
van

4. /f/
off
fan
life
/v/ of
van
live (adj.)

5. /f/
off
fan
life
leaf
/v/ of
van
live (adj.)
leave

6. /f/
off
fan
life .
leaf
rifle (a kind of gun)
/v/ of
van
live (adj.)
leave
rival (someone who competes against you)

7. /f/
off
fan
live (adj.)
leaf
rifle (a kind of gun)
safe
/v/ of
van
life
leave
rival (sb who competes against you)
save

8. /v/
veal
/w/
wheel

9. /v/
veal
vent (an opening to let air circulate)
/w/
wheel
went

10. /v/
veal
vent (an opening to let air circulate)
vest
/w/
wheel
went
west

11. fail
vanish
enough
very
dive
cough
off of
have
faint
laugh
save

12. /f/
fail
enough
cough
off
faint
laugh

13. /v/
vanish
very
dive of
have
save