sk/s – ski/see, skip/sip

sk/k – ski/key, scar/car

sl/s – slide/side, sling/sing

sl/l – slime/lime, slip/lip

sn/s – snail/sail, snap/sap

sn/n – snail/nail, snap/nap

sp/s – speed/seed, spider/cider

sp/p – spy/pie, spill/pill

st/s – stick/sick, stand/sand

st/t – star/tar, stick/tick

sw/s – sweet/seat, swing/sing

sw/w – swing/wing, switch/witch