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a good Samaritan a wet blanket a feather in my cap a piece of cake
concentration construction conversation communication
Yes，it isn’t No，it is Yes，it is No, it isn’t.
Yes，it isn’t No，it is Yes；it is No，it isn’t.
so that as soon as before because
Lo/200; Lo/250 Lo/300; Lo/400
Yes，it isn’t No，it is Yes，it is No, it isn’t.
Lo/200； Lo/250； Lo/300； Lo/400。
am used to was used to have been used lo used to
lo/200； lo/250； lo/300； lo/400。
ε＝（Lt－Lo）/（Lo－Ld） ε＝（Lt－Lo）/（Lo－2Ld） ε＝（Lt－Lo）/（Lo－3Ld） ε＝（Lt－Lo）/（Lo－4Ld）
a kind of kinds of kind of a kinds
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