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Pupils usually have difficulty with words ending in sts, dth, pth.
2
No fewer than a quarter of a million free parking spaces are available on the sts.
3
Some officials estimate that betw six or seven thousand persons are now begging in the sts.
4
STS-133 will be a six member crew: Discovery's retirement is well earned.
5
Etoposide given by 72-h infusion is inactive as second-line chemotherapy in STS.
Usage of heat-stable enterotoxin in English
1
A single hybridizing fragment was detected on the plasmid of ETEC strain 27D that also encodes heat-stableenterotoxin Ib and colonization factor antigen I.