Suppose I have a vector  ["A_cont_1", "A_cont_12", "B_treat_8",
"AB_cont_22", "cont_21_Aa"], I hope I can extract the strings which include
3 short strings, say "A", "cont" and "2",  that is to say, "A_cont_12",
"AB_cont_22" and  "cont_21_Aa" will be extract, using a relatively short
code (using grep?).
Would you please to give some idea? Thank you !

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