maybe we can try doing so by "connecting/transit stops" format for expressway services:
Jln Kayu: 86, 168, 858
connects Ang Mo Kio, Yishun, Woodlands, Changi Airport, Tampines, Sengkang
Punggol Rd (TPE): 27, 83, 86, 88, 89, 161, 965
connects Ang Mo Kio, Jln Kayu, Punggol, Hougang, Woodlands, Changi Airport, Tampines, Pasir Ris, Loyang
Tampines Central: 27, 72, 168, 969
connects Hougang, Punggol Rd (TPE), Changi Airport, Pasir Ris, Woodlands, Yishun
Pasir Ris Central: 39, 88, 89
connects Punggol Rd (TPE), Yishun, Loyang