spl- splat, splay, split
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thr- three, threw, throb
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thr-thread, throat, through
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str- strange, street, struggle
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spr-spread, spring, sprinkle
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spl-splash, splendid, splinter
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str- strap, stray, strip
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shr-shriek, shrimp, shrivel
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shr- shred, shrub, shrug
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scr- scrap, screw, scrub
spr-spray, spree, sprig
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scr-scratch, scream, scribble
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