The S challenge

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SUMMERTIMEWNPEELSANK AYDSIMILARELPMISADES YGISYTIRALIMISKUNKTS ACSUOFGSTINKSLAMCALR LDPPMTYCUEQIFHFSCISM SXAPPILSHZDPOFHKDHSP DLNESNOWVESBIIUEOTRK SNWRFFUTSBKTRXHWOSAL YXMSYAWEDISTWNECSALA PLSTUMBLEIUJSRKTTLUW MLHLRQSWSTALKFSTUAGE HESUBSTITUTERTFRPMND PHRKBDAZRAWFUSSOEAII YSZEAKFSEHDCQLIHNNSS KAMLPSFKDHKSLESSDDMA CEAGIULIGKORZDUNOEYE ISUNUGSRQMSUNKMSURVS TOKILRSTEAKSLACKSYRJ SRVSHOULDERELBBUTSLB BOGAVSUBMARINEHPNHIA
1.
Similar
2.
Similarity
3.
Simple
4.
Single
5.
Singular
6.
Stuff
7.
Staff
8.
Stiff
9.
Stack
10.
Stick
11.
Stuck
12.
Stink
13.
Stalk
14.
Stock
15.
Short
16.
Shirt
17.
Skirt
18.
Side
19.
Sideways
20.
Sidewalk
21.
Slide
22.
Sled
23.
Sleep
24.
Slay
25.
Slap
26.
Slack
27.
Slam
28.
Salamander
29.
Salad
30.
Sea
31.
Seashell
32.
Slip
33.
Super
34.
Stupendous
35.
Supper
36.
Steak
37.
Stubble
38.
Stumble
39.
Skunk
40.
Substitute
41.
Sunk
42.
Submarine
43.
Sank
44.
Sink
45.
Some
46.
Sum
47.
Summertime
48.
Shower
49.
Shoulder
50.
Snow