Silent Letters
1- kn: know , knee , knot
2- wr: wrong , write , wrestling
3- gh: eight,night , high
4- ign: foreign ,sign ,design
5- alk: walk , talk,chalk
6- mb: climb , lamb , comb
7- sc: science , scene ,scent
8- mn: column,autumn, damn
9- Ps: psalm, psychiatry, psychology
10- Bt: debt, doubtful, subtle
11- T: listen,often, fasten
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