adding other test cases used by submitty

hws/inverse_word_search/test10.txt

@@ -0,0 +1,4 @@
+3 2
++ cat
++ one
+- on

hws/inverse_word_search/test11.txt

@@ -0,0 +1,13 @@
+7 6
++ chore
++ anchor
++ horse 
++ melee 
++ wear 
++ beast 
++ oboe
++ bow
++ bottle 
++ beaches
++ laser
++ wobbler 

hws/inverse_word_search/test12.txt

@@ -0,0 +1,22 @@
+15 3
++ aardvark
++ lilith
++ amount
++ tilde
++ true
++ bore
++ loud
++ illicit
++ lll
++ aaa
++ ama
++ aba
+- hat
+- bh
+- el
+- al
+- ul
+- at
+- vo
+- ve
+- vb

hws/inverse_word_search/test13.txt

@@ -0,0 +1,12 @@
+7 5
++ beans
++ erasing
++ amaze
++ arm
++ soapy
++ moo
++ normal
++ sling
++ bakes
++ go
++ gang

hws/inverse_word_search/test14.txt

@@ -0,0 +1,17 @@
+5 9
++ wacky
++ wednesday
++ deans
++ sear
++ youre
++ ode
++ random
++ mosh
++ shado
++ mean
++ moose
++ sombody
++ kalm
++ sake
++ old
++ code

hws/inverse_word_search/test15.txt

@@ -0,0 +1,17 @@
+10 5
++ fiery
++ human
++ alien
++ incredible
++ ship
++ pea
++ patron
++ nepal
++ retry
++ rap
++ aesh
++ shapes
++ cram
++ herse
++ minas
++ semen

hws/inverse_word_search/test9.txt

@@ -0,0 +1,25 @@
+4 2
++ pin
++ pine
++ nip
++ ink
+- a
+- b
+- c
+- d
+- f
+- g
+- h
+- j
+- l
+- m
+- o
+- q
+- r
+- s
+- t
+- x
+- v
+- w
+- y
+- z