Double consonant when adding -ing

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1.
sitting
2.
swimming
3.
petting
4.
wedding
5.
jogging
6.
drumming
7.
slimming
8.
swimming
9.
beginning
10.
running
11.
winning
12.
digging
13.
planning
14.
clapping
15.
dropping
16.
wrapping
17.
chatting
18.
cutting
19.
fitting
20.
knitting
21.
quitting
22.
shutting