Correct: fir, birth, girl, flirt, squirm, girth, irk, kirge, third, shirt , chirp, whirl, birthday, first, irksome, whirlwind, firmly, stir, thirst, shirk, dirt, thirsty, squirrel, quirk, firm, birds, dirty, thirty, firmer, whirling, Incorrect: spring, splint, thrill, scrub, shrub, squid, splat, spree, three, scram, shrill, scrap sprite, throng, scribe, shrimp, shrink, split, stretch, scrunch, shrank, strand, scratch, strap, square, stripe, shrine, script, struck, splash, spool,

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