Seven letter mnemonics

I-walker I-waller I-walk-37 I-wall-37 
 
 

Eight letter mnemonics by adding an extra digit to the end

I-walkers I-yak-jerk I-yak-jess I-yak-jest I-yak-kept I-yak-kern 
I-yak-less I-yak-lest I-9-Al-jerk I-9-Al-jess I-9-Al-jest I-9-Al-kept 
I-9-Al-kern I-9-Al-less I-9-Al-lest

Ten letter mnemonics

up-pi-walker up-pi-waller ups-I-walker ups-I-waller 
us-pi-walker us-pi-waller 8-psi-walker  8-psi-waller 
up-pi-walk-37 up-pi-wall-37 up-shy-all-37 up-six-all-37 
ups-I-walk-37 ups-I-wall-37 us-pi-walk-37 us-pi-wall-37 
us-shy-all-37 us-six-all-37 
 
 

Eleven letter mnemonics by adding an extra digit to the end

up-pi-walkers ups-I-walkers us-pi-walkers 8-psi-walkers 
up-pi-yak-jerk up-pi-yak-jess up-pi-yak-jest up-pi-yak-kept 
up-pi-yak-kern up-pi-yak-less up-pi-yak-lest up-shy-Al-jerk 
up-shy-Al-jess up-shy-Al-jest up-shy-Al-kept up-shy-Al-kern 
up-shy-Al-less up-shy-Al-lest up-six-Al-jerk up-six-Al-jess 
up-six-Al-jest up-six-Al-kept up-six-Al-kern up-six-Al-less 
up-six-Al-lest ups-I-yak-jerk ups-I-yak-jess ups-I-yak-jest 
ups-I-yak-kept ups-I-yak-kern ups-I-yak-less ups-I-yak-lest 
us-pi-yak-jerk us-pi-yak-jess us-pi-yak-jest us-pi-yak-kept 
us-pi-yak-kern  us-pi-yak-less us-pi-yak-lest us-shy-Al-jerk 
us-shy-Al-jess us-shy-Al-jest us-shy-Al-kept us-shy-Al-kern 
us-shy-Al-less us-shy-Al-lest us-six-Al-jerk us-six-Al-jess 
us-six-Al-jest us-six-Al-kept us-six-Al-kern us-six-Al-less 
us-six-Al-lest 8-psi-yak-jerk 8-psi-yak-jess 8-psi-yak-jest 
8-psi-yak-kept 8-psi-yak-kern 8-psi-yak-less 8-psi-yak-lest 
up-shy-a-5-jerk up-shy-a-5-jess up-shy-a-5-jest up-shy-a-5-kept 
up-shy-a-5-kern up-shy-a-5-less up-shy-a-5-lest up-six-a-5-jerk 
up-six-a-5-jess up-six-a-5-jest up-six-a-5-kept up-six-a-5-kern 
up-six-a-5-less up-six-a-5-lest us-shy-a-5-jerk us-shy-a-5-jess 
us-shy-a-5-jest us-shy-a-5-kept us-shy-a-5-kern us-shy-a-5-less 
us-shy-a-5-lest us-six-a-5-jerk us-six-a-5-jess us-six-a-5-jest 
us-six-a-5-kept us-six-a-5-kern us-six-a-5-less us-six-a-5-lest